Goofyfoot, Your rationale is as pointless as mine, so, go for it. I will say that I trust Syntax, since he is not one to say anything at all, unless it is from his personal experience and is strongly felt.
By the way, I do not know why building a cartridge as 2-channel mono would be more expensive than building it as 2-channel stereo, especially not "exponentially" more expensive. For one thing, a spherical stylus tip is usually preferred for mono, and such a tip is less expensive than any other shape. Be that as it may, the Miyajima Premium is built from the ground up as a mono, for what that's worth.