It’s for brevity, one assumes, though you can always poke holes into any such generalized pattern that is being recognized in such manner - e.g. “people tend to eat food when they are hungry”, except people hooked up to an IV line, or those who eat on a schedule, or those who lack a proper hunger response pattern, etc. The presence of exceptions does not, generally, disapprove the “rule” (of thumb).
It’s for brevity, one assumes, though you can always poke holes into any such generalized pattern that is being recognized in such manner - e.g. “people tend to eat food when they are hungry”, except people hooked up to an IV line, or those who eat on a schedule, or those who lack a proper hunger response pattern, etc. The presence of exceptions does not, generally, disapprove the “rule” (of thumb).