In Musashi's era, meaning the late 1500s, kendo (sword fighting) was absolutely about being as "productive" (read: lethal) as possible.
As it happens, this was also the era when firearms had just been introduced to Japan. In 1575 Oda Nobunaga demolished the Takeda cavalry at the Battle of Nagashino, marking the first time firearms had been used at scale in Japanese combat, and in 1600 Musashi participated in the decisive Battle of Sekigahara where both sides used them extensively.
The end of the Sengoku Jidai was triggered by a warlord (Nobunaga) who equipped his armies with massed ashigaru levies armed with long spears and tanegashima arquebuses. It was absolutely a technological brawl where the valiant highly trained cavalry of warlord's like Takeda Shingen got mowed down by the bullets of musketeers stationed behind well prepared and covered firing positions.
If it was still going on today, the warlords would be adopting drone warfare and vibecoded 3d printed cruise missiles.