American shows tend to be 20+ episodes a season
A lot of American TV is dumping this model and I think it's for the better. Look at recent seasons of Good Place, for example. 13 episodes per season with a winter break in the middle. It makes for a lot tighter TV.
That said.
I 100% agree on Elementary vs Sherlock. I liked Sherlock. Elementary, on the other hand, I tried one or two episodes of and it just felt bland. It felt like Yet Another Cop Procedural with a Sherlock set dressing haphazardly tossed on top.