It's not about whether it's "perfect", it's that it's more expensive for farmers to raise traditional mixed purpose chicken breeds - meat breeds grow faster and put on weight more efficiently (to the point that, uh, some of them often break their legs growing so fast and I hope those ones are banned). It's just more cost effective to kill male chicks from egg breeds than to raise and sell them.

I don't love the system but it's definitely about cost rather than taste.

It's more that chickens bred to lay eggs are different breeds from meat chickens and less efficient to raise for that purpose.