In another comment I also remembered kdenlive. Not even sure what gnome has since I don't edit video.

Gedit (or now gnome-text) is more equivalent of kwrite. Gnome doesn't have an equivalent to kate, me thinks.

Umbrello: https://github.com/gaphor/gaphor

I use smplayer on windows, this is a good app. Does it run on Wayland? And does it have hardware acceleration for decoding? I had issues on Wayland (gnome) with it.

Cantata is abandoned.

Files I excluded because dolphin is better functionally. It wasn't excluded because I want to skew results in my favor, but because there is no discussion. One exception: in dolphin you cannot open files directly from smb:// shares