Is "shape wear," like Spanx, for females false advertising, similar to push-up bras?

[Thatsamazing]

... Since most guys want a girl who is actually slim and fit and in shape? Seems like many guys get a lot of criticism (especially online) for wanting a girl who is actually attractive, rather than a girl who is overweight. What do you think? If a female is wearing shape wear, is she pretty much done with her attractive years?
But also though, if overweight/chubby/"thick" females are still attractive, then why does shape wear exist at all in the first place? Why cover up the alleged beauty of natural rolls, or whatever?

Updates

+1 y

answers

[Miley19new]

Well, they dont make a drastic diffrence tbh. If a lady holds all her weight on her belly and she wears a corset, she will look slightly slimmer and have a better posture but she won't look like Sofia Vergara.
Same with push up bras. If a girl has A cups, she won't look like she has DDs. She will only seem to have perkier, rounder boobs.
Also most of the times, you can tell when somebody wears those type of things

[Thatsamazing]

A hell of a lot of girls wear them, considering they don't make a dramatic difference.

[Texaskid1]

Yes.

False advertising. What if I put a rolled a up sock in my pants? Samething.

[Anonymous]

then she gone wonder "why did he leave me, what a pig!"

[In_Trance]

Yea. Then they wonder why they get ghosted