GM is almost out of business quite simply because the cars it made were not as good as those of its competitors, not because it was too focused on stretch goals.
Run from anyone who tells you that setting goals for yourself is anything but a good thing to do. A lack of goals is the surest path to mediocrity there is.
"The greatest danger for most of us is not that our aim is too high and we miss
it, but that it is too low and we reach it." - Michelangelo