No "till", plenty of living beings have vestigial elements that were positive at some point of their history, yet no longer are, but are still maintained because there isn't evolutionary pressure to get rid of them.
The genes were from Neanderthals not to make them unattractive and they're also not vestigial. One is a very common gene related to blood clotting and can cause a higher risk of heart disease.
In other words, humans were fucking Neanderthals and we know it because of DNA. If they had never gone extinct it is without question the boinking would have continued.
I'm sorry, but this isn't correct, adult human females have breasts to hide when they are in estrus, by always being swollen, it's called hidden estrose, it's a whole thing. This has a lot of data backing it up. I KNOW I'M SPELLING IT WRONG! PROOFREADING IS THE LAST RETREAT OF COWARDS!!!!