The caveat is that it actually doesn’t matter unless you’re only ever in that one app with the screen on. In reality, the majority of phone screens getting brun in are show models in stores and defective panels. But regardless, apps lead you more into fullscreen so you don’t even have those at the bottom.
Isn’t almost any keyboard able to last that long?
I make sure any motherboard I buy has at least 8 USB ports, so I know I’ll have enough. It does make sense to use the PS/2 port if you have the peripherals. What advantage does USB have over it anyway?