I'm rocking a 2060 with an astounding 6GB VRAM... And the only game that gave me trouble so far is Clair Obscur. I had to close everything else, and use a mod to optimize the graphics.
I'll blame the shitty Nvidia drivers for Linux though, cause there is no shared RAM, unlike on Windows. 8GB with an AMD card should be fine -if a bit limiting- for a generation, except for high end AAA gaming I guess.