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.
Hey holy shit! Someone else who knows this is in there! Two of us!
I got around this just using a local IPC on whichever box and a wlroots compositor (I think river right now? They’re all tiny). Wezterm is just locked in a remote multi plexed session I can fire scripts from the one with a keyboard. Startup isn’t really noticeable in wasted time, but it isn’t nothing. Consider this a promise to circle back if I do find something, it would have been a pain in the ass at another job.
Broadly I think it’s funny a lot of the same people who taught me the Unix philosophy don’t seem to understand the irony of refusing to move from the monolith. (Not that that’s you specifically, but Wayland actually gets it right for the most part).
The defense you hear from people like me is less fingers in ears that there are problems, and more the response to people who have tried nothing and are out of ideas on how to arrive at the same place differently. Im currently doing several things I was AGGRESSIVELY informed were impossible and wouldn’t ever be, but there’s so few people using some of the functionality in xorg I wonder if its back to hacking things together with pipes and scripts for the niches, remote display pretty much has been superseded by the common web server.
I started IT hearing stories of migrations back and forth from xorg/plan 9, and I did some of the troubleshooting in the early xorg era. you can trust me or not when I say I will choose the situation with xorg/Wayland now infinity times over that.