(for cases like Heroku) When infrastructure staff fuck up, people don't die. There's a massive difference between "make sure a few scripts I wrote earlier work right" and "patch up the guy who can see his guts cause some drunk driver ran a red light at 3 AM"

>What happens when the IT staff needs to get a developer on-hand to resolve an issue? Wake them up?

Yes. Have you never worked at a place with an on-call dev team?