Exactly. It also matters what type of shift work. If you’re late to a hospital nursing shift, that sucks because you can’t do the changeover stuff and they’ve been there 12 hours. Or if you’re the only one taking phone calls in the morning or something. In sane a world, there would be room for decent folks as well as folks who are always on time.

If there is no buffer for shift changes, they're doing it wrong. Just in time is a bad model in general, but it's horrible mismanagement for scheduling shifts.