There’s no name for this way of thinking, but if I had to steal a term, I’d use Merlin Mann’s Appropriatism. It’s not minimalism, it’s not maximalist, it’s just-right-ism. Goldilocks was on to something. The idea sits somewhere in the middle, exactly at the crux of whatever works the best with the least amount. The core precept of all of it is this:

“Add things until it starts sucking, take things away until it stops getting better.”