If you do not want to change it, at least inform the user how the Anki algorithm works.
I am sure a lot of people never bothered to tweak the settings, not to mention reading the manual to understand what each parameter means and how it affects the algorithm. I think once people know how the default setting behaves, they would tweak it immediately.
In the default Anki setting, if you get a card wrong, the New Interval for lapses would render it new again, like you’ve never seen or learned that card.
My point is, just because you temporarily couldn’t retrieve the information doesn’t mean you have to re-learn it, treating it like you’ve not learned it at all because that piece of memory is still in your long-term memory. Losing retrieval strength ≠ losing storage strength.
For example, you’ve changed your phone number after using the old one for years. If you’ve used the new number long enough, you’re bound to “forget” the old number (retrieval-induced forgetting). But do you think you need the same amount of time memorizing the old number when you need it, like you have never seen it? Of course not! Maybe just a few initial numbers are enough to jog your memory and you’ll spill out the rest.