One of the criticisms I hear about MMA is that the practitioners are "Jacks of all Trades". However, often this criticism comes from someone who claims to train in a "complete system", that is a martial art without a singular skill focus, but one that trains striking and grappling skills, and perhaps some weapons work. So what's the real difference? Here's my hypothetical situaion:
Person A trains, per week, two hours of strict striking (boxing, Le Savate, many TKD schools, etc), two hours of strict grappling (most Judo or BJJ, Western wrestling, etc.), plus one hour of strict weapons work (Kendo, jojutsu, Medieval dagger play, etc) and an hour of open mat/MMA sparring, where they use their striking and grappling skills in conjunction.
Person B also trains six hours per week, but in a "complete system": most Hapkido or classic Jujitsu, many Kung Fu schools, etc. In this hypothetical situation, the time they spend striking tends to average two hours per week; ditto with grappling; blending the two elements takes up roughly one hour a week; weapons work takes up roughly an hour a week. I realize this tends to throw off the preferences for many systems under the "complete style" label, but please bear with me for the sake of the example.
So who is the "jack of all trades" in this situation, if they are both spending roughly the same amount of time refining the same skills? Is the real difference simply the training of all skill sets under one label?