And for half the use cases you still need one. Unless you go full SaaS (which may or may not be an option depending what you are doing, and what's on offer in that field), you still get stuff which needs to be administered, updated, patched, etc. Maybe not the OS layer (or maybe even that), maybe not the DB (but then it might cost more), but you're not getting away from that.

You only really start saving at some scale (get a small core of cloud-literate admins, and now you can have them run thousands of systems for effectively no incremental cost)