I'm also using X11, even though I've attempted to switch to Warplanes twice and had to switch back due to screen sharing and remote desktop being trash or just breaking after some update or other (most recently, browser). It's a work machine and I simply can't waste an hour fucking around with it. Aside from those issues which are deal-breakers in work, there's a bunch of minor annoyances I won't go into, thrust not deal brakes but they're "there". With X11 everything I need just works. I'm on a bleeding edge distro (OpenSUSE Tumbleweed) so I'll probably try it out on a weekend every few months to see if it's better. But in fairness I did that before, made the switch and then lost screen sharing after some random update...
Screen sharing was the final hurdle for me. I switched to running Slack in a Chrome tab and it works better than it ever did on X11 for me. I've used it on both my work computers for a few years now and it's been totally solid.
