i agree fully that weight parity is a good thing, but bear in mind that if you do that in f1 you have to do it across all the single seater series at least. in the lower stuff, the guys who are taller and naturally broader can get away with dodging the weights, because you don't need a great deal of strength, just stamina. when you get to gp3 and f3 and need more upper body strength it gets a lot harder to hit the ideal weight if you're not very slender naturally.
so a lot of these guys are creating unhealthy habits to keep to weight limits in their mid-teens. not only is it when they're developing physically, it's mentally as well. blackmailing yourself to undereat and stay at a certain weight because if you don't you can't compete in the sport that forms a big part of your identity is a really terrible idea.
i'm not sure what the rules are in endurance racing but they seem to encourage a far more healthy body and lifestyle - when you get a scrawny single seater kid crossing over the first thing they do is pick up the weights and get their shirt off on instagram
and if we're talking about this with male athletes, who naturally carry a lot less body fat than their female counterparts, you can imagine how a woman would struggle if she happened to be very gifted but also.... very gifted.