Correct me if I'm wrong but I think most of the frustration people are having with the percentages is simply that they're there
It's that human brains are notoriously bad with probability (nothing to do with a lack of "INT" or anything. It's just the way it is. They may be aware of the randomness (in this case the rolls), but actually expect something else. This can go even for paid, professional QA.
https://youtu.be/MEewLWDpscA?t=1498
