Exotic how? Just being 533Hz isn't; you can get very cheap chips that are capable of polling the keys at 1000Hz or higher.

If you really want to minimize latency on a modern system, and can choose whatever commodity hardware you want, you can get the input+rendering+scanout delay below 10ms. At that point it's a matter of how often your screen accepts new frames. And with a high-end, frame wait plus pixel response time can also be under 10ms.

20ms for local end-to-end latency is a completely achievable goal.

https://www.blurbusters.com/gsync/gsync101-input-lag-tests-a...

Their best combo here achieved an end-to-end latency of 12-15ms, on a 200/240Hz screen with counterstrike running at 2000+ fps.

At a more mainstream 144Hz to the screen, running the game at 'only' 288Hz, end-to-end latency was 13-19ms.

Even at 60Hz they could easily keep the latency below 30ms.

Exotic in the sense that pretty much all gear that is polling 1000Hz nowadays is gaming gear. I never implied it was unattainable - I have a 240Hz monitor, G903, and still use the ps/2 port and the games. However I wouldn't doubt the fact that my 240Hz monitor is exotic.

As for touch screen technology, the Apple Pro Pen I believe is only 20ms and is state of the art. While I do believe that developer ux has contributed to lazy resource management, it's also clear that sub-60hz latency has regularly required exotic hardware.

It's still "generic USB". When we're talking about the difficulty of it, it's entirely fair to pull in a $30 keyboard.

Touch is hard to keep ultra fast. But with physical buttons it's mostly apathy.

High end USB peripherals are polled in 1 ms intervals and even the cheapest ones every 8 ms at most.

usb interrupt endpoints (used for keyboards and mice) can poll every 1ms. Giving you 15.5ms on average to do the rest