Are 240hz screens just gimmicks

Most medium high end gaming laptops are finally rocking oled screens. I've noticed they also have 240hz refresh rate as opposed to 120/140hz that's been common in recent years and that's already more than enough.

People who have those 240hz refresh rates already - can you genuinely tell the difference? Or this is just a thing for online competitive games where people need to have 200 frames and 5ms internet ping with a wired mouse?

I'm just thinking if it makes sense to limit most games to 60-90 frames on powerful GPUs for better thermals and longer lifespan.