nuances of when to use what terms despite each term being roughly equivalent (such as: what is the difference is between "affect" and "effect")

Maybe it's an effect of me having English as a 3rd language, but... what nuance? They're two different words.

I find most people are almost unnecessarily terse, leaving out important context that they think is obvious and assume that everyone who receives their message will make the same observation

I shouldn't need to "read between the lines" to understand what you want me to do.

I've been told that's an aspect of being on the autistic spectrum, that "normal people" will have no trouble picking up on the missing context.

Always sounded to me like an excuse for being sloppy, like maybe the lazies are lowering the "autism" bar too low... but who am I to judge anyone, but a simple chap on the spectrum.