I think the problem with btrfs is that it entered the spotlight way to early. With Wayland there was time to work on a lot of the kinks before everyone started seriously switching.
On btrfs a bunch of people switched blindly and then lost data. This caused many to have a bad impression of btrfs. These days it is significantly better but because there was so much fear there is less attention paid to it and it is less widely used.
You said:
Not if you were using Ubuntu in 2017 when they switched to Weston as the default display server for 17.10 and lots of people suffered a great deal from how half-baked the project was at the time.
I said:
Yes, the release notes you linked do not mention Weston at all.
Unless you think Wayland is the same as Weston, I don’t see how you think I’m being “deliberately obtuse”.