Hello, It is nice to be able to do both sides equally. This can be done by the training the weak side harder. (Ambidexterity) Is it really neccessary to be proficent equally? When we hit someone with speed and power, the more important thing is to hit the right place , than a very powerful strike. So the left hand strike is a little weaker, still could cause a lot damage hitting the right areas. Yes it would be nice to have equal power and reflex. Look at people who are only right handed or left handed, does this make them a bad karate person...No....Just my thoughts.....our brain is has two parts ,the left side and the right side ,hope they both work equally well......? Aloha