Hi Al,
I think you’re probably right. Electrical sensitivity per se won’t guarantee a system sounds natural necessarily, nor effortless, and of course, there’ll be systems like the one above that perhaps can sound both effortless and natural while being on the low side of sensitive.
I think in the context of what Steve has said about David’s system, it’s inescapable to consider whether a system based on technology birthed during the early stages of last century is deemed “natural” because of those technologies or in spite of them. Perhaps it is neither, but it gives me pause to reflect that technologies are often abandoned before their zenith, and wonder whether Alon Wolf’s experience in building the Ultimate contributed to the sound you heard with the M Project. Maybe. Maybe not.