To be fair, as you allude to, the scene that ends every update is the MC (and anyone sharing his bed) going, "ZZZ". It's possible that someone would see that and save and quit, knowing the update is over. With the last two updates being single days (in both cases, with the characters waking up in the wee hours for some activity), anyone used to the normal two day updates* might go to the "rollback and save" screen to confirm it's over, but in a two-day update saving when they go to sleep for the night is pretty safe....
Lastly, if you do what the listed person mentioned (something that most people who play these games probably do, I would think ... I know I do) and roll back when the end of the update appears to make a save a few panels early, you still have to REACH the end of the update to KNOW that it's time to save (even if you usually can tell and save on a particular scene that always comes before the goodbye screen before you get to said screen). That means you STILL saw the "SAVE NOW!" screen and chose to ignore whatever text was there telling you that saving on that screen was important, even though it's NOT what a normal update ending looks like.
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*NOT a complaint, as these have been very full days.