Point 1: the sport has ramped up the requirements, starting back in JO , so that by the time they even get to NCAA, their bodies are so beat up that they have a hard time lasting the 4 years...and especially if you have crazy coaches that try ( and succeed) to get around the NCAA rules of 20 hours required by making them "volunteer" to come in for extra cardio, running, weight training etc . The coaches will flat out say "yeah we're limited to 20 but if you don't volunteer for the rest , you're not on this team".
And in terms of the requirements, my oldest didn't do a double back on floor until her 2nd year level 10...or a back tuck on beam either...and it was kinder to their bodies...now it's pretty standard to see double backs in Level 9 and the BT on beam...just earlier pounding and it is lasting longer...and the college coaches don't know how to preserve their athletes because the NCAA mentality is "what can you do for me today, in this meet?" so they do endless reps and beats the crap out of them..
Point 2: "SLOW MOVING CHANGE": remember that first word, SLOW.....nothing in NCAA really favors the student athlete when it comes down to the nitty gritty, especially if there's an issue. If all is going well , and the kid has their scholarship, and they luck out and get an actual human being in their coaching staff, well yeah, they're ok...but if a problem arises, all favor is to the NCAA, period...they hold all the cards in any type of issue with the athlete...and even if they PULL a kid's scholarship and the kid wants to transfer, the kid still has to request a release from the original school ( who pulled the scholarship) to go somewhere else on their own dime...and the original school can say NO!!! Utter rubbish...