The article this article references is great:

https://tonsky.me/blog/tahoe-icons/

The icons are dogshit. Honestly, I didn't notice how bad they were until reading this. I didn't really enjoy them, but I wasn't paying enough attention to them. Now it's hard to miss how bad they are.

I think it helps me find things faster and is subtle enough that it doesn't look ugly. Rules are made to be broken.