A quick idea, as systems have become more complex, needing more threading and such to perform at scale, I think many developers are reaching for functional programming techniques to make the code easier to reason about.

I'm not a pure functionalist, but I recognize some nice things: immutable by default, composition instead of inheritance, chained operations/monads.

I've personally become a huge fan of Rust, while this isn't a pure functional language, it definitely inherits a lot from them, but it also doesn't force FP on you.