This popup was recently introduced in PR-2174.
I don't know exactly why, but voyager prompting me that I'm about to lose my progress was sort of strange to me in the context of scrolling on lemmy.
I understand why someone wants such a feature, but IMO this should be turned off by default and available as an option.
As someone who also doesn't use this. I disagree.
Its really easy toggle the feature off in the popup itself and its a lot less frustrating to see a warning than to lose your place.