By encouraging beginners to do so, it allows for them to understand the basis of pressuring their opponents. Keeping in mind that the opponents are of similar skill level, continual striking will allow the kenshi the time to develop the ability to recognize openings (suki), work on waza timing, and develop stamina for prolonged matches. Once a beginner starts to develop their own style through basic training with sensei and senpai and numerous matches with their peers, an introduction to a more difficult concept can be "introduced" slowly.
I say slowly because it takes time and "patience" to even grasp a fraction of the depth of seme or san satsu or more commonly known as san sappo (三殺法), or literally translated as the three kills law. It is easy for an instructor to explain the philosophy verbally but very difficult to get kenshi to understand as it is a concept they must comprehend and incorporate into their own style. They must also have the ability to be flexible to adjust to opponents and recognize different forms of seme.
Law 1 - 剣を殺す - Kill the sword.
Law 2 - 技を殺す - Kill the technique
Law 3 - 気を殺す - Kill (your opponent's) spirit
I'll be honest... When I began my training as a child I had no concept or understanding of san sappo. As most children, I was taught instinctively, by repetitive drills, until san sappo was honed entirely by my action and reaction during weekly keiko and matches. I had no appreciation for the subtleties or the depth of pressuring my opponent. To me it was virtually a game to see how I can get my opponent to move, drop his or her shinai, or get them to back down. The best part of this game was killing my opponent's timing. Finding ways to beat them to the punch or learning ways to make their techniques ineffective. Even at a young age, I could tell it was frustrating for my opponents.
I really didn't start to develop my own style of san sappo until I achieved yudansha status in Goju Ryu Karate. As many may know, kumite or sparring is a big part of Karate training but what most don't know is that ideals such as san sappo, zanshin, and shin gi tai, are explored more deeply in the practice of Karate kata. Furthermore, in Goju Ryu, kata bunkai or application has tremendous depth where waza can be analyzed (kakushi waza - hidden techniques) on multiple levels which is distinctly different than Kendo kata, where the basic kihon is the focus.
This is where I find the beauty in Kendo... Strictly in its simplicity. Four basic targets and your opponent, both on equal footing, equipped with only your shinai and your spirit. Every match may have a different outcome but may be equally fulfilling regardless if you win or lose your bout.
What is so important to my training today is that I better understand the concepts of Kendo through my maturity. Winning at all cost is no longer the main objective of my training. This simple realization has opened a whole new world to explore, especially when focused with an opponent and allowing my instincts to take over. My seme is no longer fueled by the wanting or desire to win, it is more methodical to better understand my opponent. Do I pressure with "Ki" or do I focus on speed? Does his or her kamae limit certain strikes or their effectiveness?... are questions that are no longer pondered when in the actual match and more deliberated in my head once the match is over.
They say in Kendo there are five different mind sets that one must master. First is the beginner's mind. Next is the lingering mind, a level where you begin to understand and have a grasp on zanshin. Following is null mind or mushin, which is where your training instinct takes over. The final two are levels I am too far removed from to even discuss, fudoshin-immovable mind and senshin-purified mind. I only bring this up because your seme and how you follow the three kill laws will differ from level to level. In my humble opinion it will also differ from your philosophy of Kendo as well.
As I grow older and gain a better understanding of the martial spirit, I find myself reinventing my Kendo ever so often. These realizations allow me to question my own philosophy, which in turn may change my strategy. The humbling notion is that everything points back to kihon which allows me to break down my style and build it up again. This process also refines on how I follow san sappo and how I choose to pressure my opponents.
Always a work in progress,
Kay