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That may be true for one hone & one razor but I always lap my hones as I don't just hone one single warped razor on them. IME a worn hone becomes less effective but I don't think that is the point...

I can see that but I think a less confusing to way to explain the stroke for the average bear is that it requires the toe to be raised a few thousandths of an inch.

So now I'm gonna split hairs :)

Although that diagram may be accurate for a freshly made warped blade. Most of the blades we work on are previously honed so the flats will contact more than just...

I think it's splitting hairs to say exactly what part of the hone you are using eg. the edge or 'x' millimetres near the edge.
The degree of the warp's concavity will determine the contact points &...