Yeah... that's the idea behind the schedules. Yes, you can do pretty much anything with enough scripting, but the idea is to make a system that handles that sort of stuff so you don't have to make a million scripts.
My main experience is with Bethesda's stuff, but yeah, a simple schedule was enough for the vast majority of characters and creatures, most of whom weren't scripted but were just given a timetable and whose AI filled in the rest.
