Peter Ledermann has admitted he only makes low output MI cartridges so that buyers can use their expensive MC phono stages with them.
That’s a really interesting point, in favor of high-output MI (and MM). Since there’s NO moving mass penalty with regards to increased coil turns, the only potential cost to SQ would be in the signal going though more wire, and higher inductance. The advantages would lie in vastly simpler & easier phono amplification (less gain stages), and making the electronic noise floor drop away from consideration. In net, it seems almost silly to get a low-output MI cartridge? What would be the practical benefit to low output MI? It seemingly doesn’t make sense to buy a $multi-K LO-MI just because you wanted to reuse a LO-MC phono stage (extra gain stages) that (for some reason) didn’t have a switchable "just MM" mode.