I've been using Wayland for 3 years now. First through Hyprland, now since August 2025 through Niri. Zero fundamental issues. Some developers don't want add Wayland support in their apps or can't because the app is using some framework and their devs don't want to support Wayland. But honestly ditching apps that don't support Wayland was one of the best decisions in my dev life (along with ditching MacOS and later Ubuntu). That's how I ended up using Neovim since Jetbrains needed ages to add Wayland support. 2.5 years into using Neovim Jetbrains finally added Wayland support. So I've accepted their offer to use Intelliji for free for 6 months. I barely opened it in 6 months, despite having been Jetbrains Evangelist for 7 years before switching to Neovim. That being said you can still use most of x11 apps through xwayland with a few limitations (primarily no fractional scaling) or in worst case through qemu.