I don’t think it is ‘unflattering’ at all to show the real shape of breasts without hoisting them up to unnatural positions. Boobs are not there to be pleasing for small-minded western men to look at. Many women have similar shaped breasts to these models, which they are made to feel are disgusting and abnormal when not covered or lifted. These models have normal female bodies and don't deserve to be criticised or altered.
Imagine how many women have read your post, and thought, ‘oh, just when I thought plus size bodies were starting to become acceptable, I now have to hate my boobs.’
My god, we used to only have size 6 models, now we’ve got more variety, but their boobs aren’t perky enough for your liking?!
You haven’t complained that Kate Moss and co are braless in every single catwalk show. Or the likes of Monika and Rachel with their nipples poking you in the eye every episode.
And to all the ladies who have breasts like the lady on the ASOS advert, or like Lizzo, more power to you!