I've been 1x on all my bikes for the last ~2 years.

30t 11-36 on the fattie, NW raceface ring with sram type 2 RD

34t Wolftooth dropstop ring up front and 11-36 on the Niner hardtail racer. Sram type 2 RD

30t 10-42 sram XO1 on the PunkAss

Narrow/wide coupled with a clutch RD and proper chain length and you'll rarely drop a chain.

Haven't wished for more gears on both the top and bottom ends of any of my drivetrains.

Front derailleurs are dead to me.

Silent bike, less maintenance, and less weight / components to be worries about.

1-by for the mutha f'n win