There should be content that requires you to use 4*s and under
I apologize if this isn't the right place for this. I don't think the title for this really makes much sense, so let me elaborate. See, there's really no place to use 3 and 4 stars. That makes sense, but I feel like it'd be nice if there was some sort of content that restricted you to 3/4 stars. Maybe it's just me, but I feel like it'd be cool to have a place to use lower rarity champs, instead of just letting them rot. The rewards don't have to be anything crazy, maybe just a unique title or something.
I dunno. Maybe this already exists? I guess Carina's challenges are kinda similar. And hey, maybe I'm completely off my rocker and this is a terrible idea.