The most visible recent change regarding fuzz was the v2-to-v3 shift. In v2, fuzz was applied, but after grading, so likely an average user never noticed it. In v3, fuzz is included in the intervals on the answer buttons. [There were also logic updates in fuzz between the 2 schedulers, but that wasn’t very visible.]
Obviously switching schedulers included more changes than simply making fuzz more visible, but as a point of comparison –
Category A – users who elected to start using the v3 scheduler when it was available. Unless they read the FAQ about it, I don’t think they would have had any warning about that change. [I don’t recall there being a link to the FAQ in Preferences where you enabled v3 – screenshot from ~Aug 2023]
Category B – users who were forced to shift to the v3 scheduler when v2 support ended. They were notified they needed to move to v3, and given a link to the FAQ.
Category B caused a big uptick (observationally/anecdotally) in folks asking questions about why their settings weren’t being respected. You can offer information to people, but you can’t make them take it.