Why are cis women usually so insecure about having small breasts, but trans women don't usually care about their tits and breast augmentation is far down the list of priorities?

Do girls really feel insecure about having small breasts?

Small breasts on a woman are like a bald head on a man. By and large an unnatractive physical feature, but there certainly is a large minority of people who can really rock it and honestly look better than they would with conventionally beautiful bodies