>>2165269Costs vs Benefits. That 5-15 min skit video you watched probably took 1-2 background hours to make, what with all the scripting and editing that goes into it.
Over time (let's say from 2018, when the skit format was popular and all the old kings, to now, where all the newer biggest vtubers are basically streamers and none of them really heavily rely on canned content anymore) they figured out they could use those same two hours more efficiently by just spending time playing a game live and raking in the superchats.