Well, of course, if you don't believe that medal winners at any country's national championships, regardless of age, have earned the right to skate at Worlds without any artificial impediment, then that's your perogative.
But, by the way, the fact that "Everyone knew the rules going into this" carries no particular merit as an argument in favor of the rule.
If you have enough ability to win a medal at your country's nationals, you go to Worlds. Period. If you don't, you don't. Period. What could be simpler and fairer than that? Janet Lynn was in Senior Nationals at 12 because she was good enough. She went to the '68 Olympics at 14 because she was good enough.
Actually the only one who has a "right" to go Worlds is an eligible National Champion and we don't have one of those. This is a sport. In sport. there are rules that every has to abide by. Nobody was cheated out of anything. That is important.
When Janet Lynn skated, she wasn't doing programs with multiple triples. She wasn't doing Competitions all season and traveling hither and yon. It was an entirely different world. I don't think the age rule does enough to protect these children, but it's a start. We don't have to rush these kids. There's time. Letting them develop more slowly has to be better for them.

