If Radiant Dawn had actual support conversations, that game's support system would be literally perfect imo.
In Three Houses, as much as I like that game, it never felt like higher support ranks had any actual impact. And in Echoes, only a few (read: one (Alm/Faye)) support had any meaningful effect on unit performance.
I also liked the affinity system, not gonna lie. Changed how units worked depending on who supported who. Was neat!