> What use-case does "one binary I wrote in Go" satisfy that isn't covered above?

In .NET land, one of the top reasons to go all-in with a single exe web server would be performance. Kestrel can be unbelievably fast if you remove all of the layers of indirection like IPC and hosted SQL. I've got dynamic HTML pages that render in <100uS and that includes managing session state and other queries into SQLite.

Concerns like accidentally showing up on the front page of HN or even petty DDOS attempts can be often be ignored when you are able to serve content this quickly.

The other major reason I like it is having everything in one type system and debugger experience. I can set a breakpoint anywhere and inspect everything.