Chords missing from MIDI Chord Player?

[uselessdetails]

I was just wondering why, when I set the MIDI Chord Player to "Chords in Key only", most of the chord color options disappear?

Certainly the sus2 & sus4 chords are relevant. And M7 is only partially relevant. So why just 6 & M7?

Built in chord player is a great built-in, btw. But the limitations mean I'm back to my previous plugins and will never use it.