I suppose that's true.
But I can't think of a music type that would benefit from it. Machines: perhaps the Nakamichi, with it's well documented treble boost, would be a better machine than a flat(er) responding machine. But I don't have a Nakamichi to use for this test, and no intentions on getting one.
On the same (properly calibrated) 3-head machine, with fine bias adjusted for each subject tape, my testing has concluded there is a significant difference in noise floor as well as a difference in the distortion (which may be the abruptness it comes on with the MA, or the way it distorts in the MA as compared to the SA- that I have not really identified) that I have to record an MA about 5dB lower in level (with the same input source/day/machines) than the SA, to reduce the distortion to below audible limits. Double-coated SA tapes (SA-X) seem to allow hotter signals before distortion as compared to SA, and I suspect the MA-X would behave similarly, and allow more signal (to artificially depress the noise floor). However, I speculate the MA-X v. SA-X would show a similar result as the SA v. MA testing I have done myself. I don't have an available MA-X for this testing to prove it out, but it stands to reason.
Therefore, I conclude an MA-X should perform on par with an SA tape, if that all holds true. Comparing current market pricing, it doesn't make much sense, unless you have a bunch of them already on hand to use.