It’s surprising how many plastic surgeons mess up the nipple placement. It’s such a give away in nude photos when the nipple is up on the top half of the breast. I think it depends on how the implant is put in and the skin stretches? I’ve even seen models with nipples slightly pointing back towards the girl’s face.
They should be always half way on the breast. Even if the boob is sagging towards the belly button. The nipple is still centered on the boob.
Of course implants are intended to make the lady look nice in clothing. Thats how she presents herself to the world. If her blouses look nicely filled out then she’s happy.