That assumes that action is cheap and likely to lead to success, which is not necessarily true. In many fields, acting when you shouldn't can even lead to worse

That assumes that action is cheap and likely to lead to success, which is not necessarily true. In many fields, acting when you shouldn't can even lead to worse outcomes than doing nothing. Even when the outcome is relatively neutral, if taking action is expensive (in either money spent or in years wasted) then taking action might still be the wrong call.