Those genres aren’t really known for having brutal performance requirements. You have to play the bleeding edge stuff that adds prototype graphics postprocessing in their ultra or optional settings.
When you compare non RT performance the frame delta is tiny. When you compare RT it’s a lot bigger. I think most of the RT implementations are very flawed today and that it’s largely snake oil so far, but some people are obsessed.
I will say you can probably undervolt / underclock / power throttle that 4090 and get great frames per watt.
I’m not so sure. Companies were definitely buying many up, but they typically stick to business purchasing channels like CDW/Dell/HP etc.
Consumer boxed cards sold by retailers might have went to some small businesses/startups and independent developers but largely they were picked up by scalpers or gamers.
I work in IT and have never went to a store to buy a video card unless it was an emergency need to get a system functional again. It’s vastly preferred to buy things through a VAR where warranties and support are much more robust than consumer channels.