But I actually am interested in learning about the merits of NRC.

I’ve been using the stock workout app, but I added a new Nike watch, and I’ve been curious. What does it get me that’s better/more interesting? I’m curious about the little coached workouts but haven’t tried any.
I'm happy to share my thoughts on the NRC app, but I wanted to make sure that people knew that the new NRC app was working great (after one run), and that the conversation didn't delve into a "I can't believe anyone still uses the NRC app. It sucks. you should use ....." discussion.
Obviously, everything that follows is my opinion of the app, based on using it for many years, back through when it was initially introduced as Nike +. The Nike Run Club app has been great for me overall, but it seems like every few years they introduce a new version of the app with new features, but it either takes away features that you loved (like the Challenges) or makes the app unstable at recording runs correctly. In the cases where it doesn't record the run correctly, it eventually gets fixed, but it can be a long time coming.
I switched the the NRC watch app when I got my Series 2 Nike/Apple watch in early 2017 (from using the phone app), and it worked perfectly for almost 200 runs, until October, when they released the Series 3 watches. From that point on, I had tons of issues with the app; things like the app wouldn't start a run (although it showed the countdown to the run starting), or it would crash when I tried to save a run, or it wouldn't record any distance. I suspect that the main issue is that the version released alongside the Series 3 watch was designed to take advantage of the newer/faster/more energy efficient processors in the Series 3 watches, and the Series 2 can't keep up, at least while also playing music in the background. I haven't heard of anyone having serious issues with NRC on the Series 3. I would buy a Series 3 if I knew that was definitively the issue, and I knew that the app wasn't going to be broken again when they release the Series 4 watch. When I say that fixes can be a long time coming, the app stopped working correctly (series 2) around mid-October, and now, in early February, it seems like they may have gotten around to fixing it, so 3.5 months.
Back when they ruined the phone app, I saved a copy of the older phone app & just kept reinstalling that on my iPhone so I could continue to run. With the watch app, since I can't do that, I try out each of the new versions of the app (I still manually record my runs into the phone app, even when I'm not running with the NRC app) so I can keep all my running data in one place & I get alerts when new versions of the app are released. If the app version works, I keep using it, but if I get any errors, then I switch over to the Workouts app, until the next version of NRC is released. Fortunately, lately almost all of the error I see lately still allow me to find my actual running data so I haven't really lost anything, it's just a pain to have to manually update every run.
I like the NRC app for a couple of reasons.
1. I have a lot of 'friends' on the app and I can open the phone app or the web interface & see how I am doing compared to them. It's pretty motivating when I'm 2 miles behind someone to get out there & run when otherwise I wouldn't. I find that the app helps me to run on more of those days when just I don't feel like it. Also, the watch app will sometimes (I'm not sure what the parameters are for this to happen) show a message that I'm 4.5 miles behind a friend & that allows me to adjust my run length to overtake them in the standings. Maybe I turn a 4 miler into 5 miles. Sure these are little things, but Nike has done a good job of gamifying exercise to make it more enjoyable (at least for me). They used to be way better at this, and you could set up really fun competitions with friends. They took that away many years ago & I think they brought back some version of it, but I haven't used it since.
2. NRC offers achievement badges for various milestones (fastest 5K, longest run, running on your Nike Run Club anniversary, running on Chinese New Year, running 50 miles a month, etc). I find those enjoyable to get, and motivating to get out there when it's cold out (like the New Years badge).
3. Every now & then, you'll get a audio message at the end of a run from a Nike athlete or coach, saying 'great run' or something like that. This was a lot cooler back in the day when they used a lot of Nike athletes. Lately, it seems like it's only their running athletes & coaches. They used to have messages from famous athletes in all kinds of sports. The messages are random, so it's always fun to hear one.
4. I can see (on the web app) how I compare to other runners within my age range/sex, so that is also motivating.
5. The website (and to a lesser extent the iPhone app), shows a history of my running activity that would be difficult to achieve with the stock workouts app. I can see what my mileage, distance and average speed was by month (or by run) going back all the way to 2006. I have a Numbers Spreadsheet that I update every month, based on this data, that compares my stats to prior years so I can see if I am improving or not.
6. Nike has a running routes section of their website (not available in the iOS app) that allows me to see where people are running in an area. I use the heat map feature of this when I travel to find running routes that the local are using (for some reason, the maps won't work on Safari at least on the Mac-not sure if they would work on the iPad, but I doubt it, I think they might be built using flash) It is literally the only reason I ever open Chrome on my Mac. I found an amazing running path in San Diego that was only a mile away from our hotel last year.
7. Also on the running routes section of the website, you can create running routes. I use these in maybe an odd way, but I like to run whenever I travel. Afterwards, I like to take the GPS data and draw a running route on the Nike site, and add my run to it. (I think Nike's idea was for people to create them beforehand & then run on those routes)
When I'm done I can see my running routes on a map of the world & it's pretty cool to see, plus every time I look at it, I am reminded of fun trips I've taken.
Anyways, kind of a long post, but those are some/most of the reasons I like the Nike app & will continue to use it. I haven't tried to coached runs, but I'm sure they are done well.
If anyone here is interested in becoming friends on Nike Run Club, let me know. To me, NRC is more fun, the more friends you have. My nike user name is my actual name & I'm not a fan of posting that kind of info on random websites, so either PM me your Nike user name, or else PM me for mine, or I guess if your NRC user ID is something that isn't personally identifiable, feel free to post it in this thread. Sorry for the extra step.