The point not to overlook is that a Phon' with a Built In MC / MM Channel can be a Phon' that has an MC Input that when experienced proves a real challenge for a MM Input being coupled to a SUT or Head Amp'.
I could easily live with my multi adjustable MC Input on a owned / used Phon'. The options available by having both MC / MM Inputs and the additional devices that cans be added, has enabled myself to discover a end sound that satisfies myself, but not at the expense of leaving the MC Input unwanted. I demonstrate the MC Input to others, to help with their own learning about end sounds that can be produced.
My preferred end sound is certainly not ubiquitous, and the MC Input has been very well liked by some of the individuals who have been introduced to it.