clearstream
(He, Him)
He seems pretty consistent, although agreed his thinking seemed to crystallise as he went along.The barbarian's Rage is mostly limited to the confines of combat by RAW. RAI, I can only speculate since Crawford flip-flopped on his own advice:
https://www.sageadvice.eu/2016/09/27/can-a-barbarian-hit-himself-to-keep-his-rage-going/
https://www.sageadvice.eu/2017/05/27/could-a-barbarian-hurt-himself-to-maintain-rage/
As a DM, I'd allow a use of Rage outside of combat given a clearly stated "rage appropriate" goal (e.g. bash in a door, lift heavy rubble to save an ally, etc). Once one minute has passed or the effort stops (the goal is achieved or the barbarian stops), the Rage would end. If there is a good reason to continue the Rage immediately after the goal is achieved (e.g. enemies ambush the party as the barbarian frees the last of his allies from the rubble), I'd likely allow the barbarian to transition the Rage to a new goal or combat, but the clock would still be ticking on one minute duration.
FWIW, Crawford encouraged/endorsed a similar ruling:
Flatly, the Barbarian must attack a hostile creature, or take damage. It's moot how the damage is caused, but damage must indeed, somehow, be caused. This means that in the absence of a hostile creature to attack, the Barbarian needs to be sacrificing HP to sustain the Rage. Additionally, if the Barbarian can't spare actions to attack themselves, they will need to be taking damage from other creatures or the environment.