The "UK model" as you put it is great! It means that you don't have tons of pointless filler episodes or plot device episodes where practically nothing of any purpose happens until the last 5 minutes. They are also more manageable to watch when you have children haha.
So far I've been impressed with everything on AppleTV+, it definitely has the feel of "quality over quantity". That said, however, due to COVID-19, the number of different shows and movies etc has not materialised over my years trial and I'm not sure if I will renew in January. I'm more than likely to wait a few months for new series of things like FAMK, See & Trying and then binge over a short period before cancelling again.
As for For All Mankind specifically I enjoyed it very much. I sort of wish they stayed in the 70s a bit longer but I understand the need for the time jump. Otherwise, we'd be in danger of the "filler episode" scenario I began this post with a boring lengthy season of just landing an additional module or crew to Moonlab etc each time until the season was up.
I am excited for the new season, the trailer looked good. I just hope the "war" stays cold, so to speak, and it doesn't become a futuristic 'shoot the baddies in space' sort of thing. Often the biggest dramas were around what was happening on Earth and I hope they don't forget that.