HOMC means much more wire for the coils while reduction of
mass by moving parts by MC carts is conditio sine qua non for
the fast reaction of the moving parts: stylus/cantilever combo +
coils. Obviously (?) HOMC carts are made to be used with MM
phono-pres. This means the same as production of carts for
which one does not need an (expensive) MC phono-pre. But
we need to assume that cart producers know what they are doing.