Assume you just train one technique for the next 2 years such as "a kick to the knee followed by a punch to the face". If you repeat this combo 2,000 times daily with your partner (about 2 hours), in 2 years you have repeated this 2 x 365 x 2000 = 1,460,000 times. After you have drilled this move almost 1.5 million times, when you use it against your opponent, your successful rate should be high. IMO, it's worthwhile to spend 2 years of your life time to develop some dependable MA skill so you can use it for the rest of your life. What's your opinion on this?