A while back they said they planned to run more 4* versus events, but then quietly walked it back. When asked about it, the devs said that they saw lower engagement in the 4* events.
If we assume the lower engagement was from newer players, then there are two possible reasons: (a) they were intimidated by other players with champed versions of the featured character, or (b) they didn't enjoy being forced to use the loaner 4* character.
A hybrid 3/4 versus event would help with (b), but won't necessarily help with (a). And with dilution being even more of a problem now, there's an even bigger divide between the haves and the have nots.
jamesh said: A hybrid 3/4 versus event would help with (b), but won't necessarily help with (a). And with dilution being even more of a problem now, there's an even bigger divide between the haves and the have nots.