I honestly can't think of anything that I might regret from losing Nvidia cards. Once upon a time, I used to get really excited by Nvidia proprietary tech like Gameworks or PhysX. But the drawback was always that using these was out of the question if you got a great deal on an AMD card. So little by little, I weaned myself away from Nvidia because all Nvidia cares about is exploiting their customers, instead of serving them. Every frickin' generation they have some new proprietary tech that they hype to the moon and that may or may not really raise the bar for gaming in general.
I'm tired of their antics. Their behavior is extremely anti-consumer and monopolistic and I'm surprised that they have gotten away with it for so long. If they want to make their own hardware/software platform, fine. They should do that and see where it leads them. But trying to game the free market economy by using proprietary tech and pretending that their cards adhere to DX12 Ultimate, Vulkan or OpenGL is just plain dishonest and gross misrepresentation of their actual intentions, which are centered around killing competition. 7900 XTX is about as good as a 4080. But they have spun this fantasy through their carefully orchestrated PR machine with a lot of questionable moving parts (possibly bribing reviewers or threatening not to provide them with review samples) that AMD cards are trash.
They are what Intel was to the CPU world and just like Intel fell from grace because of their monopolistic complacency, the same will happen to Nvidia sooner or later. MI300X is proof of that. I don't believe gaming will suffer if they exit the market. I really don't. There are more than enough graphics researchers and enthusiasts in the world to keep the dream going.