I don't see any material as a bad thing. But I am a reluctant convert.

I like working with the natural materials more, and I'm addicted to hackle. If I see a neck in a shade I can use, and one that I don't have already.....I will eat, drink and sleep nothing but that hackle until I find a way to get it. It's sad really. LOL But I'm also a realist. ice-dub works. Can't deny it. Not a real fan of foam because I don't care for working with it. But it keeps floating...hard to ignore. However.....a hackled fly? Hard to beat. I still prefer shellaced turkey and pheasant tail over plastic shelback though. And gave away all my micro-fibbet tailing years ago, which was replaced by hackle fibers.

Like Whatfly said....we are an opinionated and picky bunch.