One totally underrated arc in YOI is the pipeline from Yuuri being a fanboy of Viktor to
Viktor becoming a total fanboy of Yuuri.
and while I am convinced that they will continue as fanboys of one another (and husbands!), I love this detail so much because their mutual admiration for each other is what inspires them to keep skating.
Yuuri pursued a career in figure skating because he admired Viktor, and even when he was at his lowest, this kept him going. And by the end of the show, Viktor admires Yuuri's skating so much that he decides to come back from his hiatus to compete again him.
It's obvious. It's not news. But this symmetry, how they inspire each other and reignite each other's passion is killing me.