Apart from the language, what's the developer experience like, especially doing full-stack?

F# showed a lot of promise with Fable, but the community never quite got the tooling right, I think for a lack of energy/funding.

I found the tooling to be quite comprehensive, the LSP is high-quality for a small project.

There are a few rough patches too. For example, I have yet to find out how to run a single test and not the whole suite.