It is true.
You don't expect success from being greedy if you dive into both gambling and trading.
I think that the thoughts of many about gambling and trading are always the same will never be gone. But let it sink in to the minds who think about that as it is, they'll realize that there is a different for the both of it.
I think that just as there are people who praiseing in the world, there are also critics. In this aspect, you are right that no matter how much time passes, there can be people who think that both gambling and trading are the same.
But they can think whatever they want in this case, they have the personal freedom to think, but their thinking is no longer being transformed into power. So even if people have been saying for ages that trading and gambling are the same, it will never be true because there is no logic in their words.