Let's break this down:
1) The update being late is because of Patreon, large updates (4 teachers at one time), and improvements to the spaghetti code
2) The bugs are a combination of both an incest patch that's all kinds of FUBAR and trying to comply with a lot of demands from Patreon and the adult gaming public.
3) Human nature has fuck all to do with this. Cookie and co are making patches to fix the thing, there's modders trying to do the incest thing, and overall U15 could be called the Blue Ball Special, but raging out because they can't fix every bug immediately after release is ridiculous given that even the AAA game industry has shit they get wrong. See also, Destiny 2, EA's Battlefront 2 fiasco, etc.