Interesting points but couldn't you argue that it's not always the case that the longer weapon is the best? I mean yes a long sword has an advantage over a machete just as the machete has definite range advantages to a knife but that doesn't necessarily mean it's the best does it? The same disadvantage cause by having a shorter blade/no blade, could (if the disadvantaged person has any skill or training) potentially be overcome by someone who knows how to get in close and manage distance - a long sword thrust is no good when you're opponent is 6 inches away from your body after all.
Well, if you're fighting in a phone booth, then, yeah, shorter/smaller may be "better." But without an artificial constraint on range, then it's almost always better to have the longer ranged weapon. "Getting inside" is a grand idea, and most sword arts teach that it's a fine way to negate or reduce the efficiency of your opponent. But "passing the point" as it's often called is the hard part. It's all well and good to say, "get on the inside of his weapon" and it's a whole 'nuther thing to actually
do it. This isn't boxing where you can soak up a strike or two to close the range.
Also with regards to the weight of the weapon, something heavier is great for power but something lighter is going to allow the wielder more speed and one may argue aid endurance in that it doesn't sap muscle strength as much when using the blade. At least that's how my instructor explained it when I asked him how to choose the right staff for me (He asked "Do you want power or do you want speed?" and over the course of training since, I've tended to lean towards the medium end of the scale so I can try get the full range rather than being limited).
I've seen well made arguments on both sides. What I can tell you is that in very (
VERY) few instances have the lighter weapons been regarded as the "best choice." For example, in Europe (where what sword-fighting expertise I have is based), the military swords were almost always heavier and often longer than the civilian swords. While civilians may have been bopping around with light Smallswords or Courtswords, the
military was using Mortuary Swords, Basket-hilted Broadswords, and "Heavy/Military" Sabers. IMS, there was one saying I once heard (not sure of the attribution on it) that went something along the lines of, "The young men went off to the (100 Years) War with Smallswords and returned with Broadswords."
So, yeah, context is important.
Peace favor your sword,
Kirk