My friend works at an F# consultancy - from what I’ve heard it’s definitely growing in popularity! I used it for some windows profiling in 2020 which was pretty cool too, albeit only really a single script.

Thank you -- I have heard of fsharp but wasn't really familiar with the answer to the question of why use it?

The benefits of tools built into the functional programming world with complete access to all C# libraries.

But it's hard to convince a C# dev to use F# when they're so comfortable and see no obvious need to switch.