You really are not getting it. Try to think about what 1 ply means. Maybe get a piece of wood that is one solid ply and look at it.
That is me quoting myself from the post that Suga D made quoting me.
This thread is old. Suga is quoting me from a thread that is even older.
One ply blades can break in your bag. They can break because something rests on top of them. They can break because they were pressed against something else. So, not impact like banging into the table. But pressure on the blade face of any kind.
Part of this has to do with why they began to make plywood in the first place. In plywood they line up the grains so, in the first layer the grain is going vertical, the next layer it is going horizontal, the next vertical, the next horizontal. This makes the wood stronger, because it is not subject to the weakness that exists if there is just a SINGLE PLY. It is easy to split wood along the grain.
If you took a 6mm 7 ply blade in your hands and tried to bend it, it would be hard to break. If you did that to a single ply blade and you were bending along the line of the grain, the blade would be very easy to split in half BECAUSE THERE IS ONLY ONE PLY.
But I think this goes to the idea of someone needing to philosophically examine theory without trying something. Go try a One Ply Hinoki blade, see how that 10mm thickness feels, and see how long it lasts before it breaks. If you are really careful and store it in a case that is unbendable, you may be able to keep it from breaking for quite a while. But definitely don't put it in your bag unless it is in a case that is solid, like, maybe steel, and unbendable, but with foam inside so the blade won't slide around. Do they make those cases any more?
The other thing about how they break, since they split down the grain, you can have rubber on, it can be broken and you can not even realize it is broken; and you start playing and start wondering what is wrong with it. And then you take the rubber off and it falls into 3 or 4 pieces.
Now this would happen with almost any kind of ONE PLY blade. But Hinoki is soft and particularly delicate in certain ways. So, when you are talking one ply Hinoki, that just makes it more possible.
I know a guy who used to use them in tournaments and that kept happening to him. He was using a Darker Speed 90. After it happened the first time, he started carrying around a spare for in case. After it happened 5 more times, (that is about $1,750.00 in blades), he decided to change to a more practical blade.