Why is there a separation by character status on mods?

I haven't played gacha before this one, and I just can't figure out a lot of illogical things.Many fkin statuses that are always just, well... dots. Why?Why is the status on the characters and not on the weapon or at least something where it can be changed?WHY DO Mods require a damn special status besides POLARITY? For what? To stretch the gameplay and donations? Well, no, it doesn't work that way, because after assembling the anemo set of gold mods, no one else is wont farm the same mods to another status (well if they exist - the only golden aura mod for the entire game, only for anemo)