This is exactly the issue. By the time you get through post, deliver the show, and they finally pick an airdate after dithering about, it’s already often been a year since you wrapped the writers room. Then they take forever to collect all their data.
Studios and networks have become overly cautious and no longer will invest in another season until they have all the data from season 1, which is an even worse problem when it comes to animation because animation can take around a year to produce! It leads to giant gaps and declining viewership.