Why Some gymnasts can do much better with less hours ?
Why Elite program training takes way a lot more hours than regular JO program, like 35 hours/ week.
And It also seems just conflict with general concepts: more practice better results
I am sure elite programs do need more hours in general because they have to learn so many more skills and really perfect them. But I do think that a lot comes down to how the hours are being used and how many are in the training group, etc.
My daughter is in a non elite gym that is very much focused on college level gymnastics. She's a second year level 10 and trains ~20-22 hours a week (4 days at 5 hours and then 1 day at ~2 hours although some don't go to it). She's in an evening group, although there is a day group at her gym also. I think her coaches and her teammates all don't want to go any more hours than they do because they want to have a life outside of gymnastics.

And it works for them. Could they possibly have higher scores if they went more hours? Maybe. But I think a lot of them (and definitely including my daughter) would probably quit or be very unhappy. And I think there is a very real chance of increased injuries if they trained more hours. As a gym, we are quite competitive with other gyms that train more and our gymnasts are making it to nationals and getting scholarships. We have over 25 level 10s this year, split over a couple of different groups.
Also, I do think a lot of the girls that start with 30+ hour weeks when they are quite young don't stay in the sport. Many end up injured or burned out before they ever make it to level 10 or elite.