It’s interesting how much technology has slowed down.

We haven't slowed down. We simply aren't noticing the degrees of progress, because they're increasingly below our scale of discernment. Going from 8-bit to 64-bit is more visually arresting than 1024-bit to 4096-bit. Moving the rendered horizon back another inch is less noticeable each time you do it, while requiring r^2 more processing power to process all those extra assets.

No we’re getting close to some 20 year old games still looking pretty decent.

The classic games look good because the art is polished and the direction is skilled. Go back and watch the original Star Wars movie and its going to be more visually acute than the latest Zack Snyder film. Not because movie graphics haven't improved in 40 years, but because Lucas was very good at his job while Synder isn't.

But then compare Avatar: The Way of Water to Tron. Huge improvements, in large part because Tron was trying to get outside the bounds of what was technically possible long before it was practical, while Avatar is taking computer generated graphics to their limit at a much later stage in their development.