Kde connect is great, iv always thought about using it but never got round to it as im current using a wm instead of a desktop environment. If i was to switch to a desktop environment kde would be my first choice as it has so many features.
I've had issues with it for file sharing, so far that I'm sticking to LocalSend, but I really need to explore KDEConnect further, as I haven't explored the rest of its features.
I'm sure they'd welcome a pull improving the UX! https://invent.kde.org/network/kdeconnect-kde I think the implementation of the protocol is pretty well isolated from the UI, so pretty radical UI changes should be relatively easy
There's also a still in-development rival for GNOME, Valent. And it's a native program and not just a shell extension. I prefer it, and maybe it even has more features.