There was also a heavy emphasis on games being "cinematic" which necessitates photorealistic rendering.
AAA games have been pretty artless for a while now baring a couple exceptions.
Crysis 3 is over a decade old, still looks great and ran on hardware that wouldn't suffice for web browsing today. I haven't seen anything in games since then that justified a significant increase in system requirements.
I was unable to see any site that used webgl, which is almost all games site and many charting and graphing apps.
So your argument is that game engines will just decay.