[MichaelGG]

Hell, there were public, senior, MS hires that fundamentally didn't understand "var". Let alone how LINQ worked or anything like that. On HN last month, someone was critising the use of flatmap as being too complicated. Despite the type signature making it clear what it does.

There's probably lots of apps that need real boring code, so you can add yet another case to the data entry app to handle the extra 2% sales tax for a certain county in Wyoming.

I can't imagine that there's any apps anyone wants to work on that have a low bar for "cleverness". And it's mostly a one-off thing. Learning language features should not be the bottleneck on getting someone up to speed on a project. On any system of any fun or size, the domain-specific stuff probably dominates.

(Anecdote: I've had several people come onto projects with F#, fresh, no FP/F# experience. It's been very easy and after a while they wonder how they ever put up with C# in the first place. And the people that aren't able to do this, I wouldn't want to hire to work on C# either.)