At least with Sugar and SU - None of them knew at any time what the schedule was or intended to be. They thought the first episode with Lapis would be their last one, because CN hadn't even suggested they were going to produce more episode.
Then, after it became popular, none of them still had no idea what was going on. Some of the Steven Bombs weren't planned, so they felt weird with non-important episodes being toted as big deals, and some of the episodes they produced to come out rapidly had huge hiatuses in between, despite episodes being done. Don't get me wrong, a lot of the SU crew did waste time and some crew members didn't even care what Sugar wanted the show to be, but it's schedule isn't necessarily Sugar's fault. She would constantly get in fights with execs, both over the content she wanted in the show and how they treated the show and their employees - which she admits did have some impact on production, but she used that time to write new songs and figure out new characters for the show.
As for Hirsch - He kept promising three seasons and a movie, then got 'burnt out' 1/3rd through the second season, despite it taking years to air the first season alone. Then he shortchanged everyone with the content he left in, and applauded himself for how much care he had for his show while complaining the network didn't let him have his 'vision' (which was more outdated Pop-Culture References and more body-horror) since Disney wanted the show to appeal to kids and wouldn't give him free reign. Like, he wanted a Labyrinth parody, which is fine and Regular Show did it, but he wasn't doing anything with it like they did, he just wanted Mabel to lust over Bowie and re-hash the movie's plot, and Disney said no.