Not that anyone cares *when* I did this, but I made this 15 days ago.
It doesn’t seem hard to me to do this.
As a person who used to make app icons at Apple, I don’t think the situation is that the designer doesn’t know, but rather the decision maker who is supposed to have taste doesn’t know. (If this person isn’t Alan Dye, then that’s even more embarrassing for him that he’s not the person making that call.)
Also, slightly purpler is better. More Mac, less Mail / Safari like I said before.