I can also only recommend Fritz!Box (I have the 7590). The OS does everything I need for my home network and I’ve had no problems with it since I got it about 6 years ago. Quick correction, it was 5 years ago, I looked up the recipe to be accurate.

I’ve had very few problems with KDE Plasma (on Fedora) since I swapped to it like a year ago. Discover is being weird every now and then, but I mostly use dnf directly anyways.