I once read a metaphor that has really stuck with me: each of the different paradigms of programming are like different kinds of cooking. So if all you know is imperative programming, it's like all you can do with any food is roast it, and if all you know is functional programming, it's like all you can do with food is boil it. Sure you could easily get by that way, but that would be a boring cuisine, wouldn't it? You couldn't even reasonably cook every kind of food. The more of the various programming paradigms in their purest form you've understood, the more apt at solving all kinds of problems you will become.