because a fair number of us currently playing nutaku aigis has missed karma event and other earlier events =P missing belinda has also caused many of us to be stuck at war of magic if we don't already have despara. Also no harm playing 2 versions of aigis. having one ahead of the other (like those playing dmm aigis) also allows us to know better what units we can afford to 'skip' ourselves, as opposed to only listening to the comments of others (most prominently the occasionally clashing viewpoints)
Especially so when the 'veterans' who are so strongly opposed to having any breaks at all are saying how we should learn to skip specific event units in favor of farming resources to strengthen our core units for future events.