honestly this sounds like you've never really done it.
FP is much better for ergonomics, developer productivity, correctness. All the important things when writing code.
I like FP, but your claim is just as baseless as the parent’s.
If FP was really better at “all the important things”, why is there such a wide range of opinions, good but also bad? Why is it still a niche paradigm?
It’s niche because the vast, vast majority of programmers just continue to do what they know or go with the crowd. I spend roughly 50% of my time doing FP and 50% doing imperative (most OOP) programming. I am dramatically more effective writing functional code.
Like other posters, I am not going to claim that it is better at all things. OOP’s approach to polymorphism and extensibility is brilliant. But I also know that nearly all of the mistakes I make have to do with not thinking carefully enough about mutability or side-effects, features that are (mostly) verboten in FP. It takes some effort to re-learn how to do things (recursion all the things!) but once you’ve done it, you realize how elegant your code can be. Many of my FP programs are also effectively proofs of their own correctness, which is not a property that many other language styles can offer.
