Have you tried Fedora recently or are you stuck in its early Wayland days?

As far as I know Vivaldi is quite prepared to get things working as much as possible with Manifest V3 and putting a lot of work in their own adblocker as well because of it.

There is a version of UBlock Origin that works with V3 but it is limited compared to normal one, will see how it goes but for now I think they can delay with the V3 update for some time.

Is there a way for KDE connect to connect PC with phone if phone is on WiFi and PC on LAN going trough different router in the same network?

I’d argue the “selling” point of Pop!_OS are their non-vanilla GNOME features.