I think the hope is that a higher eligibility age will encourage coaches to teach and skaters to learn a jump technique that will be sustainable beyond puberty. Theoretically, if Eteri and Yulia had their eyes on 2018 OGM instead of 2014, it's possible Yulia would have trained her jump technique very differently, and learned something that would suit her body long term. Do I personally agree with raising the eligibility age? I don't know. But I can definitely see why it might foster more talent for a longer period of time.
But Yulia already knew how to jump when she moved to Eteri, am I wrong? And the things learned in a wrong way, when you're a child, are the most difficult to unlearn and learn it again in the right way.
But seriously, she won with a huge score which I think she deserved. She checked all the boxes, and wrote some new boxes and checked those too. As for enjoyment and performance and all that other non-judged stuff, Marin was the winner hands-down for me.