Anyone who praises FP is either a student, works primarily in academia, or otherwise never had to look at a deep stack trace in their life.

Every time a production system spits out a backtrace that's just 15 event loop calls into a random callback, I lose 6 months life expectancy. Then I go look at the source, and the "go to definition" of my LSP never works because WHY WOULD IT, IT'S ALL FUNCTIONAL hapi.register CALLS

I hate it I hate it I hate it I hate it. I support UBI because the people pushing functional programming in real production systems should be reassigned to gardening duties.