That said, the iOS keyboard has always presented its key caps in upper case. This is actually a problem for younger users who, for starters, don’t know any letters at all but, secondly, they’re always introduced to lower-case letters first. I hope some enterprising developer will build a lower-case keyboard for schools. Just don’t set the caps in Comic Sans, OK?
I've never considered this barrier before. It's interesting because it seems like something that would be super-easy for Apple to solve even without offering entirely custom keyboards.