If the rumors are true and AWU3 is getting 5G, satellite messaging and blood pressure monitoring, the technology gap to a Fenix will increase very much. They do not even have LTE on the flagship model yet and I suppose won't get soon. The LTE stuff on 945LTE was lousy and crippled.
(Please spare me telling that you carry a phone anyway. I prefer not taking my phone with me for runs.

).
Btw, when looking at the Fenix 8 forum: a lot of bugs that have been there since release and still not fixed. But new players there telling the folks that their problems are not real ("I took a photo of my Fenix 8 in darkness and look, you can't tell me that you can barely read yours. I can"

).
There are full blown videos addressing the dimness issue with Apple Watches as well. The issue is simply likely to be that old eyes can't read text at the featured 1 nit of brightness and there is no way to manually address it to any sort of higher minimal brightness beyond using the settings for accessibility.
Likewise Apple Watch rumors have been wildly off for ages now. We were supposed to have the square sharp edge Apple Watch for both the Ultra and 10. It didn't happen. We've been promised longer battery life, blood sugar tracking, and blood pressure monitoring for years now via rumors. Instead Apple has turned off blood oxygen on newer watches.
It's completely false ...
I have developed my own running app and I don't do any post processing on GPS positions.
I do nothing to smooth route or stick it to maps and it's really accurate.
You fail to address the native GPS processing which your app utilizes as processed by Apple. I have a road with a sidewalk near where I run. When I use maps to create the route and run on the multi-use path next to that road and sidewalk but over approximately 20 ft, the Apple Watch puts me on the sidewalk every single time.
MacOs vs Windows, Apple vs Android.. Apple vs Garmin... The first and second debate has largely ended.. People chose their camps and life continues.
The same will happen with the Apple vs Garmin debate. My only issue is when you hear people say serious runners only use Garmin. This is just patently false. We can debate which one is better all day.. but as many have pointed out, you can easily use an Apple Watch for training and racing marathons.
You absolutely can use an Apple Watch for training and racing for marathons. The issue becomes that people play up the smart side of the watch and largely have to ignore that or turn it off on any non-ultra watch to be able to complete that training.
Most regular Apple Watches will survive the tracking of a marathon if their battery health is pretty good, they put it in low power mode and they don't use music or cellular on the watch while running the 26 miles.
The problem is those are the exact same points they bring up about why running with an Apple Watch is so great. Many people will admit that on the long runs they just bring their iPhone along but that is the same "knock" they bring against the Garmin watches.
So in short, you can't have it both ways. Are there lots of people who take great joy in taking one hour walks or runs with their watches while listening to music, podcasts and so on when presumably they work as they should? Sure. There are also plenty of people who use Spotify with their Garmins and enjoy it on long runs or who just use a running belt, running shorts and so on to bring their iPhone for doing that while having a great sport tracking watch with no need for subscriptions for something as basic as navigation or training plans.
But the Apple Watch users claiming they can train for a marathon while streaming music on cellular, using sleep tracking for metrics, and enjoying their freedom from their primary phone, are likely charging daily and spending much more on services for their total cost of ownership than the $800-1200 Fenix 8 series.
That fully addresses the point of the thread premise. Plus when you realize you can also do that on a $150 Garmin and the thread premise becomes contrived and laughable.