I'm laughing more at those who kept asking SE to add her set to the MogStation like it was something very unique. I'm sure most of them were expecting SE to add the hair but they've made it clear that long hair for player characters won't happen until tech improves considerably.
1 - they're doing it specifically because players told them they would pay money for the set. At least the top is technically custom.
2 - see above
They've told us this before. While there's some clipping they're willing to let through, the amount of clipping that long hair will have until all supported player clients can handle "bones" added to hairstyles for multiple player characters displayed simultaneously isn't acceptable to them.
Think about how much clipping we get with even some of the shoulder length styles right now. It's pretty annoying. About the only "longish" ones that work are the single ponytails in the back. Hair like Yotsuyu and Ysayle would be fair worse.
I would say that if they were smart, they would stop adding long hairstyles to any NPCs other than trial/raid bosses. All it does is make the players continue to ask for them.