I've been repeatedly told to be wary of using too much lambdas in Java because some of the cow-orkers have problems with while loops, so... well, my experience with professional programming so far is that most people barely know how to code and there's little incentive to change it, since modern professional programming is just plumbing - connecting libraries together with snippets from Stack Overflow. And I'm being only a little cynical.

(And the whole argument about avoiding to use language features is ridiculous. In commercial space, people don't expect others to learn anything, as if programming wasn't a craft and as if people were born to do it. Imagine a boss telling construction workers not to use power tools because some of the young hires have never seen a powered drill in their life.)