This is not about being blind and rushing into things. This is about being in a state where you can make decisions. Compare that to a state in which you can only sit and wait. In other words, you can be positive while remaining a realist and overall cold-blooded when you make your trading decisions. I see no conflict or contradiction here. In fact, being realistic already assumes having a positive attitude.
"This is about being in a state where you can make decisions." That's what I've meant with rushing into things, making rational decisions depending on the way of your thinking (pessimistic, optimistic). No, this is some deeper philosophy that I will not be getting into, but being realistic doesn't have to do anything with being pessimistic or optimistic.
In a bad situation, you can be a pessimist and think that it could not get worse, an optimist that it will get better and a realist where you see the situation how it actually is.
I have to disagree. Indeed, if you trade by numbers and charts alone, and can actually force yourself to stick to your trading style at all times, then that might be the case. However, if you make rational decisions, they will remain rational in any coordinate system - low or high mood, the same as based on numbers. The problem is it is by far harder to remain rational when everything looks bleak to you because you are already not rational in your thinking. Overall optimistic outlook and positive mindset is the fuel for your rational reasoning engine. There is no middle ground for a realist there because you with human nature. When you think like you are in the neutral territory, in a nowhere land, you are already pessimistic. On the other hand, when you think you are most realistic, you are actually in a positive state of mind. Anyway, I don't see a single reason why you would not want to delve into this thing.
It would be an interesting discussion.