If Mint works for you, just stick with it. No need to try a different distribution to compare. You’ll know when you need it.
I would only go to Fedora if you need it. For example newer drivers (kernel, mesa). Don’t go change the kernel and/or mesa on a distribution, probably better to switch at that point. Or if you need KDE or GNOME for some reason. Wayland is disabled in Mint by default, but can be enabled. It’s been over a year IIRC since they added experimental Wayland support so it may be fine by now.
Differences between Linux distributions are exaggerated.
Yep, as for the last point: the problem was not so much the devs but data going through a Chinese server