Why does India get penalized if they generate 50% of the people interested in a tech H1B (they don't - it's a thought experiment). Why is 49% preferable to 30%

Why does India get penalized if they generate 50% of the people interested in a tech H1B (they don't - it's a thought experiment). Why is 49% preferable to 30% or 51% or 70%? Why not split male and female applicants into two pools and hire accordingly? Meaning if you get 70% of your applicants from men, hire 70% male and 30% female. If the following year it's 60/40, hire 60/40. Or better yet, fix the pipeline issues rather than put in arbitrary caps and quotas that serve only to reduce the overall quality of candidate pools.