I don't think most women, certainly not the ones with big boobs, not in my experience anyway.
But sure, the women with very large breasts are probably far more concerned with not being painfully uncomfortable constantly.
In general, it's my experience that some (maybe even many?) women are far more concerned about these sort of things than men are, just many men are insecure/worried about penis size, but women in general don't actually care all that much (in both cases, some do, but the majority don't).
Gen X women are not okay with their bodies. I feel bad.
Boomer and Silent Generation women are either very gracious and don't care OR are very mad that 80-something boobs, shoulders, and bodies don't work like 20-something boobs, shoulders, and bodies.
(I work as a bra fitter, so take this with a grain of salt as my information is going to be limited to a single geographical location.)
I was talking with my coworker about this today actually: Gen X women are in an uncomfortable position of being raised in an era of mass media and unattainable ideals without the ability to talk to one another openly and anonymously that Millennials/Gen Z/Alpha have. For example, Gen X women are (generally) way more concerned about the fat squeezing out of their bra bands than Millennial or Zoomer women even though they all have it. Likewise, most of the 'oh I can't be X size because it's 'vulgar'/'I have to minimize'/'I have to be a certain shape' comes from Gen X and older. There are very clear social messages which have changed with generation that are fascinating to watch. This is even more pronounced in the language/approach our male customers have. The older crossdressers or trans women are way different than our younger ones.
Boomers and older genuinely aren't dealing well with their aging when it comes to things like mobility, medical conditions, etc. For example, front closure bras are really useful for older women who have lost shoulder/arm mobility but there are physics trade-offs that have to be made. Likewise, a lot of them can't stand the pressure that's needed for a good fitting wired bra as their muscles/bones/etc. are less resilient so they need wirefree options but can't accept that it means they will not get the shape they're used to. I just want to grab them by their fragile boned shoulders and shake them. You're 75! It's okay! Nobody cares if you don't have the breast shape under clothes of a 22 year old!
I hope this does get better as we age. Watching older women hate themselves is so sad.
How?
Essentially, existing as an obvious female is no longer seen as an acceptable reason to sexualize them.
I'm sure the boys will still do it because part of being an adolescent is doing what adults tell you not to, but the girls might get less horrified by their breasts if the adults around them view comments on them poorly/support them.