Controlling emotions is very important and must be well understood by gamblers. when a gambler cannot control emotions well the gambler will get closer to failure. many people have experienced bad things when they cannot control emotions. but on the contrary, when a gambler can control emotions, they get closer to success.
You are very right mate and I think this is the real aspect most gamblers are not getting right. Emotional control is a very vital factor in gambling, it could either make a gambler successful or even a loser. Managing emotions is handled by a part of the brain that is known as amygdala, and it serves as memory chip,, every of our emotion either negative or positive are always embedded here.
In my opinion, we can never escape emotional management if we must excel in gambling because either ways, we are always subconsciously aware that of our emotions. I think study would have shown clearly that emotional management enhances decision making especially when under gambling pressure.