Because they don’t push updates as quickly, which reduces the chances of something slipping through, be it their merit or not. This comes at the expense that it sometimes breaks dependencies and still has close to zero real benefits:
You are better off simply using snapshots. Then you don’t depend on the testing of either party.
Even if the Manjaro devs do to find bugs, they could have found them in Arch Testing as well, which benefits everyone.
I stand by my point that the update strategy is not a feature.
Yes, Garuda does, even with bootable snapshots, but it’s otherwise not as clean as Endeavour. As far as I can tell, mkinitcpio/GRUB2 or their setup thereof causes more problems than it solves. My system was bricked multiple times until I switched to a dracut/systemd-boot setup, which works flawlessly since quite a while.
As for the user experience, there are 0 distros you should perform a (major) upgrade on without taking a snapshot first. I had broken systems after apt upgrade. From my point of view rolling vs versioned release are basically occasional mild vs scheduled huge headaches.
What should I tell you, I immediately liked it more than Win 10.
People also use Android phones and Macs and have Accounts for that. If you seriously believe this is going to drive the masses away, I have bad news for you.
Everything you listed are just small factors among many. I’m quite positive the Steam Deck / Valve are doing more for Linux’s popularity than anything Microsoft did wrong combined.
The reason I am on lemmy.world is that so far, they have basically blocked nothing and that is the experience I'm looking for. I want to be the one who decides what I see.
That said, others prefer a more curated experience and thus choose other instances. That's the beauty of the fediverse, you can have both.