The moar Kotone/Shizuku Kaede/Yuzu sentiments seem to me like they just wanted to see more of what had less focus since Haruka and Yuu were the leading characters in the story.
If one of the other pairs had been the leading stories there would of been clamoring for the other pairs instead. We're always interested in what we didn't get to see. For example I would of like to see Rina and Sumi introduced earlier.
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