Every reason in here is like removing blame from the system. All of the other aspects do not matter. Trading too big for your account, ok, if you had a working system that wouldn't be an issue. Cutting winners too short wouldn't be an issue if you had a winning system. Letting losers last too long wouldn't be an issue if you had a winning system. Over trading wouldn't be an issue if you had a winning system.
This is like if you're trying to draw. But you don't know how to draw. Note I did not say you don't have the mental strength to draw. I mean you don't know how. That's the system. You can get better paper, better markers, better easels, better whatever. You can study drawing all day. You can talk to famous designers. These things won't make any difference if you don't know how to draw. Being emotionally ready to trade, etc. does not matter and is not the biggest problem if you do not have a winning system.
This is like if you're trying to draw. But you don't know how to draw. Note I did not say you don't have the mental strength to draw. I mean you don't know how. That's the system. You can get better paper, better markers, better easels, better whatever. You can study drawing all day. You can talk to famous designers. These things won't make any difference if you don't know how to draw. Being emotionally ready to trade, etc. does not matter and is not the biggest problem if you do not have a winning system.