> Im still watching 720p movirs, video games.

There's a noticeable and obvious improvement from 720 to 1080p to 4k (depending on the screen size). While there are diminishing gains, up to at least 1440p there's still a very noticeable difference.

> Somewhere between 60 hz and 240hz, theres zero fundamental benefits. Same for resolution.

Also not true. While the difference between 40fps and 60fps is more noticeable than say from 60 to 100fps, the difference is still noticeable enough. Add the reduction in latency that's also very noticeable.