As with most things in life, people understand and learn in differing ways. To be effective you need to work out how best you learn. When teaching I have to focus very hard on what styles of learning each person has and tailor the lesson and commands to the individual. I always try to explain the why so that the concept is understood and the pupil can think about it and find the best way to keep working on the concept.
Sometimes the way I phrase a command can be the difference between understanding and not understanding and between being able to do something and not. A good example is the ‘heels down’ that you hear everywhere. Most people think they are riding with their heels down, or can’t feel that they are not so saying ‘heels down!’ doesn’t help these people. So for some of those I teach, I use ‘toes up’ or ‘floaty toes’ both of which deal with the same problem and changes how people think and I find the foot changes position much quicker and for longer. The ‘floaty toes’ also deals with the chronic heel jammer who is very heavy on the toe and has an inflexible lower leg due to the heel being too far down.
So when you are training try to think the whole way around a concept to see if there is another way you can think about it that will help you more than the way everyone else thinks about it.