from my POV the TAM for a 4090 is quite large owing to:
a) High End performance gamers
b) Machine Learning AI industry
c) Cryptocurrency
d) Content Creation / Video encoding / Video Streaming / Video Game Streaming / Live Streaming
I think anyone would tell you that the 4090 excels at all of these, and if you are doing work in categories b to d, its hard to find a better card for it. There's actual reasons to own a 4090 outside of just pure gaming, whereas you don't even have a calculator on a console today. Quite frankly the price point is probably pretty off putting for gamers, but the industry work, that's probably a price point they are willing to pay to get the job done faster. I'm pretty sure the DF team can add some insight here on how much faster a 4090 encodes.