I could see that applying if the story had been set up to be about that instead of this meandering along with Youko quietly pining away. In the end, the story didn't actually deal with anything at all.
Well, just because Youko wasn't smart about it doesn't mean the story doesn't deal with it.
For me the fact that the story only mentions it often enough that you don't forget isn't the same as actually dealing with it. In fact, the story's focus seems to be more on looking at Maki's life through a third party who happens to have feelings for her than Youko dealing with an unrequited love.
Hell, that aspect doesn't even show up until the end of chapter 8, and is overshadowed by Keita's dickishness. Even after that, it's treated in such a low-intensity way compared to everything else it's hard to see it as a major factor in the story, or indeed Youko's life.
I think a lot of yuri stories actually show you what not to do. In spite of the more comedic undertones of the series that was to some extent the case here. That part was in a way realistic.
I should highlight here that "realistic" and "good story" don't necessarily go hand in hand.
I second the notion about the guy, btw, he was an ass. And Maki's for sure better off without him (she unwittingly dodged a bullet there), but let's face it: Sometimes nice people fall for asses. Doesn't mean it's yuri in the sense that the story was about Youko's struggle with finding out she loves her best friend.
Yeah, Keita being an asshole was really my biggest gripe early on, especially since he ended up as the de facto focus of the story. And again, thanks to him the aspect of Youko getting out from under her sister's shadow was given more of a spotlight than actually getting more than a superficial treatment of her same-sex issues.
And just to be sure I just skimmed through the whole thing again and I'm actually pretty impressed at how few times her attraction to Maki even gets mentioned. Which makes the ending that much more out of the blue than when I read it part-by-part.
But Pika-chan is awesome throughout, so that's cool.