The REPL is great in theory, but trying to import packages is a nightmare every time I try.
Dependencies exist, but they all seem to target wide and inconsistent range of the ecosystem. Want to target dotnetcore 3.1? Good luck have fun: everything you find useful is targeting some combination of standard/framework/core/whatever confusing variant Microsoft decides to come up with this week.
If I somehow convinced my co-workers to adopt a language that wasn't C#, I'd point them Rust or Haskell instead.