We do like someone to be reading. After all, otherwise, we'd just be confining our stuff to our hard drives, or our noggins. But we don't.
I think writers also do (or probably should
) write to the audience at least a bit, in the sense of creating art that is accessible and understandable. I don't believe it's pandering to make the vision clear. After all, the readers aren't in our heads (at least, I hope not). Hence if the character's internal motivations are important, they need to be explained or at least hinted at, and not just - oh, the readership will get it.
Well, what happens if they don't?