Katana aren't brittle. Only the edge is hard, while the rest of the sword is flexible. The purpose of folding is to remove impurities in the iron. Japan has high levels of impurity in it's iron. When you hear about high fold counts, it is an indication that the materials were refined thoroughly. It has nothing to do with the blades' sharpness.
Not quite accurate.
Yes, the edge is hard, that means that hitting a hard surface with your katana was definitely going to ruin the edge. There was a reason the samurai had to protect their swords (with their life, even).
The rest of the blade wasn't so much flexible as it was bent easily. A western sword would probably bend and retain its shape, once you bend the katana, good luck getting it straight again!
And folding doesn't "get rid" of any impurities. The impurities in the iron created weak spots along the blade, which would be easy to break. Folding merely makes it so that each layer would reinforce the other layer, essentially lowering the chances that a single spot in your blade would snap, but making the metal crappier overall. For example, if western swords made with good iron were folded, they would be weaker than non-folded.
So it's more a case of "oh this metal is shit! I guess we'll have to fold it!"
The Katana: It is capable of cutting european style armor, in the very least a basic breastlate, this has been demonstrated.
Sauces please.
I wouldn't consider this a basis for a "blahblahblah, katanas are better" argument, but is this a sufficient demonstration? http://www.youtube.com/watch?v=EDkoj932YFo
I'm well aware of the fact this guy doesn't neccecarilly know what he's talking about, and what passes as leather armor for them is laughable.
No. Not. This. Video. Again.
Already responded in the other thread, and I think someone already pointed out the shittiness of this video. First, that "armor" looks like a thin sheet of tin, second, that's a CONTEMPORARY katana made with CURRENT materials, and third, that dumbass can't even wield the swords properly. Like, using the actual edge of the longsword instead of the blunt part, and using such stupid angle, and he'd better stop waving it around like a feather-duster!
Ok, on another topic:
I just had an argument with a coworker, he insisted that armor protects against weapons and stuff, but in a fall it would actually break your bones. He offered zero proof of this, except "well I have experience with skateboarding kneepads and stuff and they can make it worse" or something. And flexibility blah blah blah". I don't buy it - I think armor would protect against even mundane damage, not just blades and heavy weaponry. Any experts on the subject? Can falling from a horse or a second floor be worse with armor than with no armor, because you can't "roll with the fall" or some such nonsense?
Note: He also mentioned the
widely debunked myth that wearing a motorcycle helmet increases the damage of your neck if you hit your head.