Well I agree with you. I find the "sport" silly and outdated.
As a lifelong female athlete, it isn't the best showcase of athleticism, there are so many great sports and clubs for girls. Gymnastics or dance seem far more appealing if a young girls is inclined to that sort of sport.
Growing up in the early 80s the cheerleaders at school were the total slut hos and now I am subjected from time to time of friends sending videos of their teenage daughters cheer videos. Can't watch as I feel like I am watching 13 year old sparkly soft porn... then there exists the issues that the girls whilst acting friendly to one another are mean and nasty to each other behind their backs.
I even have a sibling who pushed her 12 year old into cheer so "she might hopefully be popular some day." I mean really.
All anecdotal, but I think it is an activity that is totally antiquated and encourages behaviors we are better progressing forward from.