Here's my opinion: "Everything should be made as simple as possible, but not simpler."
I usually prefer an answer that's a little too long over one that's way too short. One of my pet peeves in online discussions, on EF and elsewhere, is when a question asks commenters to explain the WHY behind their decision--and it's followed by lots of one or two word answers. Why bother posting a response at all?
On the other hand, nobody likes an overly-long rambling response. I try to stick to three paragraphs or less to avoid the dreaded TL;DR syndrome.