As we don't know the background of most posters here we always assume, in the most optimistic scenario

, that both parties know what they speak about. To know what you speak about you should at least have quite a lot of practice in the things that are discussed. It would be stupid to see a discussion between a person with a lot of practice and a person without any practice (except maybe from reading a book).
But by accident I found out that these things actually happen on ET.

This makes things really hilarious. I found a discussion between a daytrader who claims to have +20 years of trading experience, and a second trader about returns that are, or are not, realistic. The discussion was clearly about daytrading. But I found out now that the second trader, who told that these returns were not achievable, is trading stocks with holding periods from a few weeks to months. So the second trader compares his own experience in trading with daytrading!
It can be compared to an athlete running the marathon who is telling that is impossible to run the 60 meters within a certain time. How on earth can somebody who is running marathons discuss with athletes that run all their life short distances? It is a completely different discipline.
But on ET some traders think they have an expert opinion on everything, even if they never had any experience. Remember ET stands for elite traders! And if they would have any experience they would be still daytrading, except if the experience was negative. And at that point his opinion would be useless, as opinions from losers are always useless.