I'm probably going to tick off my fellow #Perl devs, but ...
So many times I hear "we need this weird feature that most languages don't have or make very hard to do." Almost every time I see that, the problem space they're dealing with is eye-gougingly bad code that they're trying to work around.
Guess what I'm doing today? Using obscure features in Perl to dynamically rewrite some eye-gougingly bad code.
So yeah, we need those weird features due to legacy.
My real horror in all of this is that my team and I are effectively re-implementing aspect-oriented programming, a paradigm I constantly warn people against.