Ironically, this post comes off as out of touch. The purpose of the various martial arts isn't just to win in a life-or-death brawl or murder people as efficiently as possible. Similarly, the point of programming isn't just to generate as much code as possible, or only to be more "productive".
What you say is true for modernized budō disciplines. They have very different purposes.
But this this is not what Musashi was concerned with. He was practicing kenjutsu (not kendo) / writing about hyōhō.
The primary criterion was absolutely murdering people as efficiently as possible in a life and death situation.
"The true Way of sword fencing is the craft of defeating the enemy in a fight, and nothing other than this"