Not for me. I've gone back and forth between projects that required functional languages, and projects that didn't across different companies. Bad code is bad code no matter what language it's written in. What makes me love my day job is whether I have the ability to make it better, and if those that work with me are aligned in wanting to do so.
I think practitioners of functional languages get a little preachy when really, exposure to functional languages should just be assumed to be part of the basic training of any engineer. It's a tool and as good as it is for some things, it's absolutely awful for others.
Low level code. Drivers, interfacing on COM/serial/USB ports, graphics programming or anything that requires more finely tuned data structures you have to manage yourself, low latency work where you can't afford to have a random GC happen at a bad point in the run loop...
I think practitioners of functional languages get a little preachy when really, exposure to functional languages should just be assumed to be part of the basic training of any engineer. It's a tool and as good as it is for some things, it's absolutely awful for others.