You seem to be mistaken. Version 2.1.15 came out in 2019. As you can see in those changelogs, and the subsequent Release Notes, fuzz was not introduced in the years since then.
In fact, I’ve searched through the archives on the old support site, and I can tell you that fuzz was alive and well and documented for years before that. The earliest references I found on a quick search were from 2017 (pre-Anki-2.1) - and that wasn’t it being introduced as new!
As ferophilia said, you’re just noticing it now because of the v3 scheduler [which you’ve complained about before, and you seemed to have successfully turned it off already]. Fuzz has been applied all along, and it never hurt you before, so I don’t see why it would start now. We might be in an XY-problem situation – you’re trying to cure fuzz, but fuzz is not new, so it can’t be the cause of your new issues.
From your other post –
linux-user:
I see no reason why fuzz should be mandatory, and seeing cards in the same order and/or close together doesn’t necessarily negatively affect memorization or recall; however, the fuzz factor itself can negatively affect retention by causing difficult material to be scheduled later than it needs to be seen to be remembered.
… I’ve wasted hours trying to learn, failing, and relearning cards since upgrading to Anki versions with V3 and fuzz.
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I think you mistake the amount of impact fuzz can have on scheduling for any single card. Other than fundamentally disagreeing with the idea of fuzz, if you want to say more about what problems you think it is causing you, and how your retention has changed, perhaps folks will have some helpful suggestions.