A non-AI generated image - it communicates to artists that they’re not welcome, while Linux is getting there in support for artists (Krita, LMMS, etc.).
A debugger with a GUI - no, I don’t care about writing shell scripts to automate debugging.
Server-side decorations on Gnome - just add an option for it FFS!
A way to easily recover from a crash during an update - I was lucky that I could do it from the command line, but my Ubuntu still likes to crash the VM host if I open Nautilus.
Drivers.
Linux devs not throwing a temper tantrum for a driver not being GPL. I know, that would be the ideal, but corporations gonna corporate.
Also web-native apps are a web 2.0 mistake, and lead to the abandonment of many portable GUI frameworks in favor of the “what if your pops didn’t had to install Word Processor, and instead just had to type wordprocessor.com into his browser” idea of some techbro. Do you know why your ÜBERGAMERMOUSE Ultrautility is 250+MB? Because they’re all Electron apps!