Considering the incredible time-sink that simply going through all gear in my inventory ─for all slots─ is everytime I want to switch job (or, more often, level up), I would very much welcome an "optimize" button.

I can't count how many times I used sub-par gear simply because I missed one piece of equipment, especially considering it's impossible to keep it sorted since every switch will actually swap a piece with another (I'd like to at least have gear sorted by level/kind of stat). So I've given up on sorting gear manually and just go through all 25 slots x 13 slots (at worst) when I level up, if I wanna make sure I'm optimized. I takes way too long, so I just don't do it that often.

But I'd wager we'll get that feature from addons, not from the barebone client.