I agree.
It would seem you misunderstood my statement... and as such, I completely agree with you. I, in no way, think that training is impractical. In fact, I think training is the only way to learn and make better those skills which will benefit you on the street.
My statement was less generalized as interpretted. In fact, what I was saying is something that many students and teachers have found to be true about training. No training, nor technique, as it is practiced will ever work out on the street just as it is practiced. There are too many factors and variables, and the situation is too different to perform exactly as you would in practice. In one sentence there is no way to say just that without seeming to generalize.
Training on targets or practice partners is not the same as training with live subjects whose intent is to do bodily harm or kill you. Your actions will be different.
As for Hatsumi-soke's statement, which I believe JShirley quoted properly, is also accurate, but misunderstood. Just as it would be different for a 5-foot tall Chinese man to fight a broad, 7-foot tall American... your weapons and strategies change. I don't believe his intention with that statement was to say that knives will not cut the same tomorrow as they do today. That would be ridiculous.
I believe the statement intends to point out that war and people change, as do the weapons they use. Just as the trench war-fare of WWI was much different from WWII and in Desert Storm and current operations, the weapons we use in our hands will find different uses and meaning.
I don't think you're statement was incorrect, Harold Mayo, I do believe that it was merely a lack of understanding the statements that JShirley and I had made / quoted.