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I run 1x10 (36x11-36) on my silly little gravelcross adventure thing because if I get to a hill where 36x36 isn't good enough, I'm probably going to be falling over backwards due to the wacky geometry of a bike that is way too small for me. Back when it was a 2x rig there was no point at all in having the smaller ring.
And goddamn it's a fun bike. It's just stupidly nimble. Sucks fucking dick for anything over 35 miles tho because the fit does not promote efficient pedaling.
Anyway, 1x, 2x, and 3x all have their place. Fuck, even 4x. Even a Pinion 18x. Especially 18x.