>>718569862
Because it actually matters to women
A girl with no tits is "whatever she's still hot"
A guy with a small dick/short stature might as well kill himself
There is no mythical girl who thinks "oh I'd prefer bigger but this is fine too" it's a hard cutoff, especially for men under the average. The average itself isn't desirable - women want the top 20% height/dick size, and if you're a bottom 40%-er you're never having a family.
You can always get more confidence, become funnier, get more skilled at something, become popular.
But you can never, ever, make your dick bigger or your body taller - certainly nothing like the ease, safety, nor cost of a titjob.
That's why guys cry about it. Because no matter what they do, through no fault of their own, they will never know female companionship, affection, or intimacy. Simply being "average" in physical attributes (let alone worse) is a death sentence to your sexual life as a man.
