Basically I agree to this point. I trade forex now. Part of the reason is money mgmt. I've traded futures but I couldn't cut my position low enough to match my capital position (POOR!). But even on a tiny tiny 1K lot with a pip loss, I find the trade is still in my head and I just don't want it there. Why? Could be wrong time of day(dead), or I'm just tired and cannot manage ANY position and I know it. It just depletes me even if I'm right. It's the big downfall of discretionary trading. It really can be a lot of work. I try to limit my physical exposure to the market. The biggest risk is burnout--ive found it costly.
Trading forex is rough because of the hours. I used to trade 6e, but only during the old Chicago pit hours/RTH. Problem was, as you know, a lot of the really good moves happen during the European session (even during Asia at times). So unlike ES, Ags, Bonds, Crude......the real volume in 6e occurs at odd hours for us trading in The U.S. IMHO to trade forex you gotta be basically trading from European open until probably 2-3 pm edt. Then ready to start trading again when Asia opens in case there is a big move there.