While it would be preferable, that ultimately doesn't work out because they need a new Flavor of the Generation to milk Merchandise out of once the previous FotG becomes Used Goods.
Lillie's just an especially major FotG because this time they designed her specifically to be waifubait in every piece of media she appears in.
As soon as Gen 8 starts, she'll be shoved aside despite all the immense shilling and waifufaggotry for the next Main Grill as the cycle repeats ad infinitum.
I still don't understand Serenafags, they're basically cucks for being mad their ship didn't happen because they want her to be with someone that ISN'T themselves.