Well, this is for a very simple REST API and the post acknowledges that much. I mean if this does become a "project", I'm sure it's time to move it to a proper framework, but as you say for a quick hack, it's a pretty nice way to do it (with proper sanitization, of course).

I'd also venture that this is an order of magnitude faster and more responsive than a framework so there are definitely some plusses and minuses to consider.