I have one of those crankbros tools too - the M19 - has a tool for everything on my bike as well as a chain-tool.

I don't have occasion to use it regularly but I have saved myself from an hours long walk a few times by repairing a chain after the quick-lick failed. I've done that twice for myself and twice for other users I've met on the trail. I'll never ride without it, the weight if acceptable for how useful it's been.

Really the most normal maintenance things I have on my rides are fiddling with my fenders to keep them symmetrical and messing with my seatpost clamp since it likes to creak after rides in heavy rain. If I didn't ride in the rain I'd have no maintenance items other than flat tires or the extremely rare broken spoke.