Usually people don't have the background. All of those things are 'parts' of the technique. That is correct. From seeing films and videos, people talk about O Sensei practicing differently at various stages of his life. I never knew O Sensei since the young times.
People think that.
People don't know that. It just looks 'soft'. If they just follow that part they are missing something. They must follow every part. Yes, that is very important, that part.