I kinda get Yuuki, in terms of remembering how I was at 16. The good thing, is that growing up and becoming more self-possessed doesn't mean that love has to fade, and in fact it offers more opportunities to grow in one another as well.
Asaka seems to have the right of it—wanting to be a supportive girlfriend so that she can see Yuuki gain friends and fill out the space she takes up in the world even more. Yuuki remarks on being able to actually articulate her thoughts to the other committee members, and while she doesn't say it outright, that's literally just confidence in herself as a person...something everyone should work to attain. And the more Yuuki learns to like herself, the more of her there is for Asaka to love, to boot.
Glad to see that Yuuki has figured some of that out at the end, though, and has realized that growing up means she'll also be growing more in love with her best friend. This series does that exact dynamic damned well, after all.
Thanks for the TL as always.