I mean this: I know (to some extent atleast) what to expect from languages like Python etc. So if I am trying to choose between say, Ruby and Python, I can use them both for a couple of weeks, and decide which to go with, depending on which I like and am more comfortable with. I also know where these languages are mostly used, job prospects of them etc.

Whereas with functional programming, I am totally new and lost, no clue where to even begin.

No, I didn't hint anything else.