Personally I would prefer if Hide was the best armor for druids to begin with, and they might get magical hide or dragon scale or ankheg plate or whatever later. Let’s not forget WotC prefer if druids don’t use metal armor, even if it’s not a hard rule. Druids also have wild shape to help them tank with effectively temp hp, and they also have Barkskin - which is redundant if you’re running around in half plate.
As long as you're not forgetting WotC's preference, they consider studded leather to be druid appropriate armor.
