Comment by pm215
You seem to be reading more into the phrase "human failing" than I intended by it. All I meant was the ordinary variations in human behaviour where we sometimes fall a little short of what we hoped we would or could do.
We seem to agree on the substance: that the SRS system should be able to work more humanely with and for the kind of entirely normal situations you describe, by for instance being able to adjust to variations in available time and picking the "best" cards to review rather than assuming the user will get through the whole lot, and in suggesting to them when they should do fewer new items to avoid difficulties in a month or two.