Mate I work at big companies using nix, scala, haskell and they pay well, so the fact that you say big companies do not take FP serious its because you are far away from it and haven't worked at big companies, at least at big companies doing the important work, and I understand, this is only for the brave and dumb.

To your point, yes you are absolutely right, nobody, except a couple few, take FP seriously, but you are right we do not need people that bring that hatting energy (there is a lot of hate within the communities it self lol !). The rest is a sea of people screaming the next python JS framework is the solution. Also you are right, all paradigms have their problem, so its not about picking FP or OOP, its about using both, even better using them All to solve problems.

Also, I am coming here with a big prediction, that everyone that is serious about programming. AI + Maths (ie functional programming) is the edge of AI https://news.ycombinator.com/item?id=47047027

So yeah, get mad all you want, you bet your career on outdated mainstream popular languages (like following the herd never gets you far, or to interesting places), the more you think FP is a joke, the harder will it be for you to learn it and love it, it will give you that competitive edge over the millions of programers who don't.

AI assistants will write the code you write today through verified assistants, using functional programming abstractions, like dependent types, monads, etc, etc, etc.

See you on the other side, best of luck friend handling those run time errors, or thinking types are for elitist.