Originally Posted by Calsun

Something I have noticed is that on the low end bikes they usually have 2x setups and the higher end bikes are 1x. This is for mountain and gravel bikes where 11-speed cassettes are the norm. With road bikes 12-speed cassettes are provided along with two chain rings to in theory provide 24 speeds, assuming no overlap. With road bikes more gears help to maintain a desired cadence on a wide range of terrain.