So why can't we have a weight distribution like this for high school?

NFHS and to many open weights in duals I guess. 100-120 leave the same (every 5 to 6 pounds). At about 120 - 148 they should go 6 or 7 pound increases from 148 - 187 7 - 10 pound increases
Then 198, 215, 245, & HWT.