I recently had opposite experience - I been using NixOS with X11+i3 for about 2 years and never had any significant issues beside some troubles with one Nvidia driver version, even most Steam games worked for me without any issues. But out of curiosity decided to give try Wayland+Sway. First Sway remind me that Nvidia GPU completely unsupported and probably wont work at all, but in really fix for that just to use some 'unsupported' flag to launch it. After that I found that displays fractional scaling only can multiply original resolution to bigger size so is no way I will able to set up my 3 different displays in way I would like. Then I found that Zoom app can't share display even if everything for that is provided and it thinks that sharing actually happen (it can share if used thought web-browser and it also some workaround with virtual camera thought kernel module and OBS). After that I found that Barrier app (that I been used to share cursor/keyboard between desktop&laptop) while has support for wayland it can't work with Sway yet and is no any real alternative.

For now I can deal with that stuff but it looks like more I use wayland more issues I see so not sure that I will able stick with it long term.

oh now I also has flickers with discord app