I never had a problem with stability, even when I was running newer, non LTS, kernels. Essentially, the risk running newer non LTS kernels is about the same as the risk running a rolling release distro.Ya no doubt lots of people install their LTS and then hack em up... as long as your not under any illusions about the stability. At that point you have your own personalized distro... which is fine 99% of the time especially if you no how to fix the odd error that may be very unique to your own distro. One thing I like about rolling releases like Arch if you do run into an error caused by an update... everyone using Arch is as well, so they tend to get squashed fast or at least you can find threads in the forums ect. (not that issues like that happen often anyway)
That is the main reason I always tell people with low Linux experience that want to game to steer clear of LTS. I mean it can be done but you have to know which PPAs to trust which not to trust... and how to fix the odd X repository update caused odd behavior even when there isn't anything you did wrong. The advice they tend to get from other neck beards is stick with Ubuntu Mint ect... I imagine because the idea of a stable rolling release seems wrong to most long time Linux users. (but us long time users find a distro we love and mostly stop paying attention to anything else). I get your point on Nvidia... it is logical to stick with a low update Distro with NV to avoid all the kernel rebuilds. Nvidia does drive me nuts on rolling I mean Manjaro/Arch push every minor kernel update and its rebolt Nvidia every time. For AMD users though rolling is just so much smoother... especially the last couple years where it seems every second minor kernel update and monthly MESA update was greatly improving game performance and compatibility.