Speaking of Hanami Plove, Saki's P love is very different from how the other idols are written. Sure, she's just as obviously head-over-heels for P like the other P love idols. But what's different with her is how P is also very obviously obsessed with her, how he's constantly pushing against the boundary of what's proper for a Producer. He knows he shouldn't pressure his idol, but he goes so far as to say that he'll quit being a producer if he can't turn Saki into a top idol. Or how in Saki's Ameagari Iris commu, he says wants to monopolize her. Unlike in Sumika's route, P doesn't cop out. He doesn't get deny that his words might be taken romantically, he only acts like he never said anything. His feelings are so strong that it even leeches into other timelines, with how UmeP becomes obsessed with Saki as well.
Honestly, it feels like Saki's commus are also written for people who self-insert as her and want to get romanced by P.