Not sure if I'm understanding you right, but I wasn't saying that my experience is the only one that matters. Just that it's not a thing one notices in practice, at least not under conditions I've experienced (I figure a reader can fill in that last bit for a comment written in the first person). Saying AOSP's is "much, much faster" suggests it would be noticeable and afaik it's not (at human timescales), so I wanted to add that info to the thread

Good point about the USB thing btw. It's obvious to me and the reason why I go one step further and leave USB debugging always enabled now that there's this private key authorisation method anyway (it asks for computers whose key it doesn't yet trust), but indeed a lot of users might follow GrapheneOS' advice without realising

I just want to note that I believe the default setting is that data is disabled for the USB port when the phone is locked except after a reboot (before unlocking the phone for the first time), so if you break your screen you have the option to use the keyboard if you reboot the phone.