I'm starting to wonder if they were grue'd.
I can answer that! Not only can I, I will.
In seriousness, I don't want the playerbase going down the paranoid road of not trusting reality and wasting a lot of effort on non-productive debate about whether something changed, so let me settle this right now.
First, a couple definitions:
By "retconned", I mean that some or all of a chapter was retroactively eliminated and is considered no longer to be part of the history of the MfD universe. Something that was retconned never happened. Retcons happen when the QMs make a mistake; usually that's a failure of simulationism (Youthsuit, Minami [EDIT: Kagome killing her]), but sometimes it's a failure of memory or consistency (Keiko mentioning a date, tipserators not blocking line of sight).
By "grued", I mean that something was excised from reality by deliberate choice of the QMs without any mistake requiring it. Things that are grued *were* part of reality, no longer are, and all memory of them and all (most?) evidence of their previous existence is gone.
By "faked", I mean that something presented on the page does not conform to in-universe reality. This is usually an "untrustworthy narrator" situation. For example, there were one or two small details of Jiraiya's past with the other Sannin that didn't happen exactly the way he described them. (That's OOC information, but what the heck.)
We're nearly three years and a million words into this story, and there are:
...very few retcons. Youthsuit, Minami, tipserators, second event attack + Cthulhu nightlights, and a few minor lines of dialogue that you probably wouldn't notice on a re-read. I think that's all. (Did I forget any, Loremaster?)
...a lot of fakes.
...exactly one grue: henge.
We use fakes a fair amount, where it makes sense. We avoid retcons like the plague; there will probably be another one at some point because the QMs are human and fallible, but so far we've managed to keep it to roughly one significant instance per year.
We do not currently have any plans to use the grue again. I won't promise it won't happen -- honestly, I find the idea of [EDIT: repeatedly and deliberately using it solely to play with the mechanic of a] breakdown in causality where only Kagome remembers the old versions to be pretty interesting.
@Velorien is strongly against it, and I recognize the problems that it would cause, so I'm not pushing for it. It's pretty safe to assume it won't happen again.
Back to the original topic:
I hereby definitively state, with no weasel words or truth twisting, that the scorch squads have not been grued or retconned.
Now, they're horrible but, on the other hand, they got your whole team to unite behind the idea of Uplift, and you wouldn't be in Leaf without that. After three long years I am FINALLY getting to write the "building a village" quest that I wanted back in the beginning. So, in that very limited and "desperately looking for a silver lining" way... Yay, scorch squads!