I don't agree with the assessment and I'll leave it at that, but there's one thing I should ask: is shigan Lucci's strongest technique? He puts his strength and haki all focused into a single point quite literally.
You're comparing a Swordsman to a non Swordsman..
You're also bringing piercing concept which is more akin to fencing than slicing, cutting someone down..
I'm not sure about the transfer of force, but what would hurt more swinging a baseball bat to the head or extending a baseball bat with all your strenght behind it.. Seems the former is easier to put power in using to lower body strenght where as the latter you can't make use of your leg and hips into it..
What tehnique zoro showed in 2 swords?