I agree with you, ease of use is where it excels.
Regarding 60P output for 24P content, my TV does reverse pulldown quite nicely, so that's a non issue for me.
Audio quality on the other hand is an issue. It's not super noticeable to me (perhaps in part because I have mediocre speakers), but there are certain scenes in certain titles where the difference between the Blu-ray and the streamed rip is fairly noticeable.
I used to be an HTPC person (Windows in my case). I found that the time spent configuring, maintaining, and troubleshooting to not be worth the extra edge in ultimate compatibility and quality. The ATV4+Plex feels like I spend a minimal amount of time getting to my goal of having a digital library of my physical media. The HTPC felt like a hobby unto itself.
On the HTPC, despite my best efforts, there would always be some new thing that liked to interrupt a viewing session...maybe a windows update. Maybe Defender telling me I hadn't scanned for viruses in a while. Perhaps my mouse wanting to give me the exciting news that a new driver is available to download from the cloud! For every notification that I could figure out how turn off, there was always a new one to hit me a month or so later. With Windows 10 having "forced updates", I suspect this will be even worse.
I see you are running ElCap. This is probably way better than Windows for maintenance, but on the other hand I didn't think there was a way to get uncompressed high resolution audio out of a Mac, am I wrong on that? How are you accomplishing that?