I really REALLY wanted to like Glasslip. That's the most important thing to understand here! But evidently, even a P.A. Works series can display such blatant ineptitude as to make that impossible.
There was even more that was left undiscussed, too—the specifics of how utterly blasted Sachi's character got, Kakeru's own "powers" and "problems" that are still completely left in the dark by the end—but that would have just been piling on at that point, and the prospect of trying to dwell on all that for much longer was too painful.
Stick with Hanasaku Iroha.