The problem with unrestricted short rests is the Warlock-type classes that regain most/all of their abilities/spell slots/dice back on a short rest. I mean, my main is a 'lock so I'm ok with that, but it makes the game esaier if you can do that.
2 per day, as mostly everyone has said, is truly the optimal amount, otherwise you can have a party of warlocks and battle master fighters and just cheese the game.
Fair enough, that's a good point.
