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I've used Ur/Web for an old project (https://github.com/steinuil/negoto). It's a very cool language with a lot of great ideas, and once you get going it really makes it easy to set up a server that interacts with a DB and dynamic frontend features.
The compiler, and its error messages, are somewhat inscrutable if you don't fully understand some of the more advanced features of the language, and some stuff I felt I was honestly not smart enough to figure out after a while. There was a point for me where most of it clicked together, but it took a long while to get there.
Ultimately what made me stop using it after that project was the features of the server itself. You can compile it to a self-contained HTTP server, but some issues that I don't remember right now made it unfit to use outside of development, so you're left with CGI and FastCGI. Like another comment mentioned, there's some stuff you can only do using the C/JS FFI, and Ur/Web's transactional nature sometimes makes it hard to tie these additions into the rest of the language. There's also some things (such as submitting a form with multiple files, IIRC) that are not supported by the compiler, and even after submitting a patch to fix some issues with the SQLite backend I didn't feel comfortable enough with the big pile of terse SML to patch those in.
Tailcall is building something similar in that regard. The idea is to allow developers to specify their orchestration requirements using a DSL and then behind the scenes generate an ultra high performance backend for GraphQL. The query could span over REST, GRPC and other GraphQL services. Check it out — https://github.com/tailcallhq/tailcall