>>52605387anon, I've been playing Persona since 2007
Persona did not invent the mechanic, shit like Fire Emblem, Tales of and Sakura Wars did it long before Persona, not to mention dating sims and a bunch of other relationship mechanics in other RPGs. Affinity mechanics are really common thing in a ton of RPGs, Persona just perfected it imo. But in SV it's not even that in depth, it's just some side content for additional story and rewards that can be ignored altogether.
i liked that SV did this though, it's a totally optional way to learn more about the characters and lore as well as mechanics. Wouldn't mind seeing something like this return for Gen 10