Because they are. What we are talking about are sub-problems, individual interactions. If there is a success, it carries over to another iteration which then has chance to happen. If not, no dice.
A major success is any level of haptic contact; I for some reason don’t process what I see/hear as “100%-real” and have to touch it or get touched so it starts “existing”. But even for such stupid little thing one has to go through a maze of nonverbal give-and-take where I reliably fail.
…have to run for some errand… bleh…