That seems to be changing, though, for many popular (expensive?) shows. Game of Thrones, Silicon Valley, all the recently-new Star Trek series, The Expanse, The Mandalorian, The Orville... They all have seasons in the ballpark of 10 episodes.
With the exception of The Orville, none of these were ever network shows, and only The Expanse aired on basic cable, which does often have ~13 episodes.
IT Crowd USA was supposed to be a primetime NBC sitcom.
