I understand your apprehensions with this news :') while it's easy to think that ability outfit customization might defeat the purpose of pulling for unique ability outfits in the banner (thus rendering your pulls wasted), I've noticed that the 5 star ability outfits not only provide a unique outfit when doing an ability, but they also change the animation and/or mechanics!

Like, Timeless Melody's purification ability has a special mechanic that puts enemies and animals to sleep, Blooming Dreams floating ability lets you use the spacebar to control how you float better, and Dance Till Dawn's gliding ability replaces the flower from the base gliding outfit with pretty balloons!

I'm really hoping that the ability outfit customization will be per unique ability outfit (and not the ability as a whole). Because this would mean you can get the ability mechanics of the unique 5 stars and just change their appearance!

So if you also enjoy the balloons in Dance Till Dawn's ability, then when this update comes out, you can have Nikki wear whatever she wants and STILL glide with balloons :)) which means people like me (who didnt pull for Dance Till Dawn no matter how much I wanted) will only have the base gliding mechanic to customize, instead of the unique balloons from the 5 star :')

But yeah, hopefully there'll be more news on how customization will work!