I'd love to use F# in production on a Linux/Mac OS environment. I find the tooling to be problematic and quite hacky on these platforms. In the same time the library ecosystem around manipulating PDF/Word/XLSX documents, CPU/GPU math accelerated libraries, machine learning, stats, charts and DB connectors are not that mature and production ready. If you just stay withing the F# and .NET core library ecosystem then it's fine. I'd need more support for the ecosystem to be able to fully switch from scala to F# for production. I'm so looking forward to having Microsoft get the full .NET to Linux.