I can run basically any game at 1080p with at least 60fps with my 1080ti, except this game.
What they did with the mesh shaders is basically the equivalent of releasing a raytracing-only game.
So now I have to wait until GPUs become affordable again, which might not happen for a couple of years still. Shame, as this was the game I was the most excited about this entire year.
And no, spending money to get the same (or worse) GPU which supports mesh shaders wouldn't be worth it.