Backports are specifically tested for the purpose of being compatible with stable, so there should be no issues.
I can't really comment on what what gaming desktops need, I feel like you could absolutely play games without the latest drivers at all times, but I don't play any modern AAA games.
If you need bleeding edge software, then don't install Debian, for sure. Or go unstable with all the potential issues.
It is truly a work of art.