I run them on most of my defensive pistols. I've grown use to them over the decades, and I think they can add value.

I guess I'm in the camp that believes that just because something might not always be useful every situation, that doesn't mean it is without value in all situations, and therefore is worth keeping if I have the option.

Having said all that, I don't personally consider them required equipment on every defensive gun I own. They are a "nice to have" for sure. If you feel you don't need them on some of your guns, or all of them, more power to you.