If the 3080 10gb really does tank in Godfall due to Vram with RT turned on as can be seen in that video then the thread needs closed. A flagship card should not run into these problems so soon after release and it's been proven that 10gb is not enough. Anyone saying otherwise is probably blinded by the card currently sitting in there machine which is likely a 10gb card.
And the GPU itself is " not enough" in other scenarios. Putting the word "flagship" in the name of a card doesn't mean it can max all games in all scenarios at launch.
I can't recall a card that was ever able to max all games in all scenarios.
Turn down the settings.