It's nowhere as complicated as spinda, but you still have to port over a all the haircuts on top of... actually providing a place specifically to make them.
Differently from Spinda, the Furfrou line still requires to animate all of the models, and as we know, currently they're not exactly having time to spare.
As I said, I'd not be surprised if Spinda, Furfrou and Alcremie are on their list of "we port them as little as possible, why did we even make this"
That's still not Spinda, whose specific problem was ILCA fucking up the spot algorithm. An issue, by the way, that literally no other instance of the Spinda Spot Algorithm repeated; it was likely very portable! ILCA had equal odds of messing up
any part of coding, the fact it inverted how Spinda generates it spots just happened to be the msot annoying one. Did you know even the first Pokemon Rumble had it fully working and it just never had a Spinda to generate? Wild right?
Point is: It's not that, it's just any Pokemon with a form change.
Changing it? You slap a NPC somewhere, give them a list of things they can do and your job is done. USUM just shoved a Furfrou barber in one of the barbers and called it a day.
Porting "all the hair cuts"? Sure, I suppose; though there's definitely an assortment of shortcuts they can take Ic an see this mattering to some extent like making it less of a priority like a lot of the early game Pokemon few people care about. But that's still not a "logistical nightmare" nor on the level of Spinda. Hell it's not even on the level of Unknown, since the animatoins are all the same.
Also weird to point out Alcremie as being on this shit list when it's already on deck? BDSP & LA were never going to have it and while it did miss out in base-game SV I doubt its textures and lowpoly accesssories and spin-tracking were why; and now its coming back anyway! I think they'd regret Cap Pikachu slightly more but boy it sure is here...didnt even have a give away when Ash left the anime!
Actualy no I think the one Pokemon they might have regrets at this point is Nincada, which seemed to keep causing problems throughout gen 8. I recall issues with SWSH, BDSP & Home all beacuse of how Shedinja works causing issues with their clone checks. Now if any Pokemon they went down the list and avoided for technical reasons for, I can believe
that one specifically. "You know what we can just take a pass on it for a few games" - Gamefreak possibly???
Honestly, if Furfrou has any "special" reason for being skipped to this point, I wonder if when Furfrou comes out they want to have a gimmick with Go. Furfrous dominate Home because Go decided to go hard on region locking Furfrou and GameFreak loves their Go tie-ins with Meltan, the Vivillon postcards, Roaming Gimmighoul....I can believe it tbh. Save Furfrou for when there's a time they can exploit a cross-connectivity gimmick.