I was hoping you'd end with "LAMP" for a second there. Many of the non critical path use cases that come up here sound like something you'd have deployed to a shared PHP hoster at the end of the 90s. Does a bunch of php files on one of those count as a serverless API gateway yet? For those use cases it doesn't seem all that different, just with added buzzwords, nicer languages and better developer ergonomics. At the cost of replacing skills in maintenance and debugging of what's going on in the stack with maintaining and debugging whatever abstraction cloud provider X put on top of it.