Thin is NOT necessarily beautiful. Thin is unhealthy. And being at the end of the range, or just over, CAN be beautiful.
I guess we can flip the coin. Overweight bachurim are slobs and ugly? Even if they wear well-fitting suits and are not obese, etc.?
But my point about learning is that if a boy is presented with dozens of names that all check, and a certain number can also promise support, who do you think will get left behind? Now I’m sure there is the concept of the nadan in the Syrian community too, I have no idea how it works, but we’re not talking about supplying linens and pots and pans. A 40 something rav commented that in his time in kollel he knew where the rent money was coming from. Now many kollelim in larger cities aren’t paying at all, or paying a token amount. This was even before the recent economic downturn. It could be due to there being more young men than they can handle, it can also be due to the willingness (ability? I have no idea where it comes from) to commit to a few years of support.