Probably because it's hard to distill years of work connecting the dots (which at first don't appear to be connected in an obvious way) in a way that is easily

Probably because it's hard to distill years of work connecting the dots (which at first don't appear to be connected in an obvious way) in a way that is easily digestable by somebody new to the field. In any case, I imagine there's more glory in digging further into intellectual stuff than spending time making it palatable for newbies. :)