I have never seen a manager complain about the use of functional programming.<p>What I have seen is amazingly intelligent programmers with FP backgrounds (who I pushed to hire) try to write in languages that are sort of FP (ie Java and Javascript). They end up writing code that is not canonical (which I don&#x27;t mind) and using academic&#x2F;haskell variable names (ie single letter variable names which I do mind heavily) and then fail to write any documentation (anecdotal observations).<p>I&#x27;m not saying this always the case but I have seen it quite a few times.