what you're both forgetting about maintenance is that, unlike AF boots Repair and Erase, maintenance can remove multiple status effects (1 for nq oil, +1 for each level of HQ oil, so oil+3 removes 4 effects). It also doesn't cost us any maneuvers (though since they changed eraser to light only, that's a lot less of an issue). Honestly, I almost never use repair to remove status effects, so I have no idea whether it only removes one or if it wipes out anything on it's list (I always just used eraser and rarely ever let my puppet get hit with multiple enfeebles anyway. If it did, I'd just leave 'em), but either way leaves maintenance as an alternative for other situations.

If only 1: use maintenance when you have multiple buffs to remove, or when you need to remove a single debuff without wasting your repair timer

If it clears: use maintenance when you need to remove 1~2 debuffs without losing your ability to repair for HP.