In general, it’s things that Wayland chose not to do so as to have a better security model.
For instance multi window apps can’t tell the compositor where to put their windows such as snapping a window to another or following a window. Apps can’t read other windows. It’s a good thing for security but it breaks some older tools and workflows.
There’s others like multiple mouse cursors, registering global hotkeys, overscan correction etc but many of these things are being addressed and new standards are being drafted, it just takes time.
I moved to Wayland very early on and, honestly, I’ve not had any problems but I don’t have a complicated or special setup.
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