The drivers often need per game optimisations these will be missing but I doubt Intel would nerf them, just rely on you not paying a lot for RAM the game won't use.

I actually meant it in a different way. I would get it for local AI stuff, but being able to game on it would be a huge plus, otherwise I would need two different machines.

Much as I want diversity; a 3090 would be a billion times better for games and can probably hold its own for a broader AI workload. Anything other then running highly quantised models that don't fit in 24GB with realativly small contexts.

A 3090 is what I have now.

But I hope to somehow have 48Gb or 64GB VRAM in a GPU that's also gaming-ready.

I was looking for maybe getting a mac studio for this reason, but I don't think a mac is really good for for gaming.

It'll work just fine for gaming. It's what the B770 would have been if it had 32GB RAM and ever got released.