I'm pretty sure we had a discussion of this subject not long ago, but I don't see it in the related questions below. I think it's one of those things which are on the list of possible changes, but not on the front burner yet. If I were to throw in my own 2 cents, I'd like to make any such warning to be optional for at least those who have a pre-1500 badge. Others who often work in pre-1500 profiles might also have it. But it might be difficult to have such a opt-out function as it might slow things down.