Agreed. I might've put "human interface" as opposed to HID, to cover the output too. We didn't design modern stacks to handle lowest latencies possible. Becaus

Agreed. I might've put "human interface" as opposed to HID, to cover the output too. We didn't design modern stacks to handle lowest latencies possible. Because everything is a tradeoff. Take a look at audio I/O on normal PC in 2000s. Although input digitizing and output de-digitizing were always fast enough, the "DSP" (moving data to userspace, processing, and out) was slow. Because in software design it was given that millisecond latencies aren't a thing, we used a lot of locks and copying around to ensure the system works correctly for average use which isn't realtime IO. However when someone desired realtime IO they enhanced the drivers and/or the audio software stack. That approach worked because there were no issues in electronics, so to speak. With gaming you have slow USB input and slow HDMI/whatever output. In my view that is peripheral issue and not architecture issue, although you can also say it is a platform issue. The question is not that straightforward.