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I think this would be a nice idea for the barbarian. You wouldn't have to track which round you're on, and it gives a satisfying amount of control over the duration of rage while also making sense in character.
Would this lead to too short and long duration rages?
Currently fatigued is very powerful, making avoiding it very important. I think having Fatigued toned down to "you have a -1 conditional penalty to all rolls and DCs, if you spend 3 actions in a round this becomes a -2 conditional penalty." while Exhausted becomes the current Fatigued would make it a better trade off.
Way too easy to game. The attack clause is in 5e, and its way too easy to not be able to attack and fall out of rage.
On the other hand, 'take damage' is trivially easy to do to yourself and maintain rage forever.