It seems to me that because Tuvan throat "overtone" chant frequently employs multiple notes/sounds simultaneously in the vocal chords of the chanter that it is objectively a superior form of chant to all other forms of chant, be they Gregorian or otherwise.
The more notes being chanted at the same time in the single individual the better. The "noble simplicity" of one note being sung at any given time by an individual singer in a sequence of single notes, and a choir of different voices singing those same notes or different notes at the same time, is not as rich and complex as it would be if each individual in that choir was singing multiple notes at any given time or at the same time.
It doesn't seem out of the question that people can learn this form of chant, and that it be adopted into a liturgical canon of the Church.
We should put in all of our best, and it seems that having to chant multiple sounds simultaneously requires great devotion.