While there are said to be some slight personality changes with Yuuka, what makes Alice's details different? If anything she's just grown up slightly.
She's grown up, lives in a large house in the Forest rather than in Makai and any relation to Makai has been completely forgotten. Pretty much everything about her besides "she has a grimoire" has been changed, just as Yuuka has changed from sleepy mansion in a blood lake to flower lover living in a big garden.
Retconning is different from saying that they don't matter anymore. The fact is that they still exist and it annoys me when people act like they don't.
You see, this is one point where it's very arguable whether or not you can say a character "exists" anymore. Whether or not ZUN says they're still around, the exclusion of the characters from everything is far more telling. It shows that ZUN cannot, or doesn't care to, bring these characters back into modern Gensokyo. Saying that they're "somewhere" holds no meaning besides saying that he hasn't outright rejected their existence completely, and this is a reasonable stance to take. He isn't ever going to say that they don't exist. So the question turns to, what do you even mean by "exist"? Are they available for fans to create works with if they want? Can they mesh with other characters and settings if the author wants? Sure. Are they canonically present in modern Gensokyo? I would say a resounding no. There is no evidence of their existence, exactly as there's no evidence that any nobusuma (for example) exist in Gensokyo. They could, and for anyone who wants to include them in fanworks of Touhou, then they can go right ahead. But as is made extremely obvious from the manga in particular, ZUN doesn't normally abandon characters and will introduce them in various places almost obsessively. He can keep repeating that PC-98 characters "exist" every time he's asked, but that answer is empty. His expression that they would be difficult to bring back is more reflective of his actual thoughts. While you might not technically call this a retcon, it's the closest to one that ZUN will ever get.
In a way, a lot of characters don't matter anymore but that doesn't stop them being popular. I'll accept the fact that most will never return but at the same time I don't expect Rumia or Medicine to return either. Gensokyo is a very different place from even the 6th game but, in the leap from PC-98, there is a very sudden change in attitude towarda them and huge drop in popularity.
Refer to my previous wallposts about how this has little to do with the move from PC-98 itself.
Also, Rumia was present in OSP chapter 12 and more recently in HM as a background character. Medicine was also in HM.
A little mention, even if just by name, would improve a character's popularity greatly. If Mima was brought back as a stage 1 midboss, it would greatly increase her popularity. You don't need to destroy everything just to acknowlege a character's existance.
This is a good point to mention, since for many people (probably non-writers, really) this might seem like a natural and easy thing to do. Like, if Mima popped up in HM as a background character, then wow, suddenly she would just exist and everything would be peachy. ZUN, and I'd say most writers seriously invested in their work... don't work this way. Including a character somewhere just for the sake of it is fickle and doesn't make sense. Bringing in a character means that they have their place, that they are a piece of the pie that is Gensokyo and mesh with it. You have fans who make works of characters who are all connected together by some means, and the characters that are "unpopular" aren't showcased as much, and the works that they're in might be solo works. Now ZUN will go back and show these characters somewhere on purpose. But on the flip side, unlike various fans, ZUN isn't going to deliberately shove in something that he feels doesn't work well, and he's a lot more picky and solid about this than the fans are. When you say you don't need to destroy everything just to acknowledge a character's existence, you're sort of highlighting the problem: acknowledging the character's existence
does interfere with things. While superficially it might be "easy", when you get down to it, it's really anything but easy.
hi this has nothing to do with the thread's main question anymore