Say you press fail on a card. Let’s imagine two scenarios, one where anki reduces the ease factor and another where the ease factor stays the same. I understand that you will have to review more often in the scenario where the ease factor is reduced compared to the other scenario where the ease factor stays the same. My question is, in which scenario does the actual memory reach the point of never forgetting (where the slope of stability is finally zero) first and, more importantly, why?
Actually, never. Human memory is flawed even with the assistance of SRS. You can aim at 85-95% retention rate in long term reviewing.