And surprising isn't it that even people supposedly actively engaged in trading view certain elements of trading as gambling. This tells me that if you view trading as gambling then you have not cracked it.
It would be more correct to say that occasionally the outcome you expect is not the one you experience.
Experiencing an unexpected or unpredictable outcome is not the same as consciously gambling.
Consciously gambling occurs when the participant does not have one iota of what he is doing or ought to be done, then it can be said to be a form of gambling, but not otherwise. The trader who knows his business and goes on to develop an edge, goes on to exploit that edge. In pure gambling, which is being prisoner to the vagaries of chance there cannot be any edge. Individuals, consequently, who have an edge, would never consider what they do as subject to the vagaries of chance, and hence are not engaged in gambling. Part of the edge is to assess beforehand what is the most likely probable outcome given a set of parameters and to prepare in the event of a neutral or unfavourable outcome in advance, which again is not gambling, but prudent and proactive strategy instead.