WOW. People still giving memory tooo much importance
None of today games need more than 8GB to run well. Even games that can consume more than 8GB do not need more than 8GB to run well as long as the GPU is fast enough. Doom Eternal can consume 9GB on 4K max setting but it it still runs over 60fps on RTX 2080 super. So memory is not an issue here
Microsoft Flight Simulator can consume more than 8GB on highest setting, but no GPU on this planet (even RTX 3090) have enough power to run it max out. So, GPU speed is the real culprit. If you have GPU with 2x speed of RTX 3080 but same 10GB it will still run 4K games way better than any card with 20 or 24GB or whatever vram it have.
Also, there is many games that use more video ram when free video ram is available, but it does not mean it needs that memory. Video memory become an issue if stutter and lag is causes by low video ram, but none of the games today have any issue even with 8GB let alone 10GB