So, I don’t actually know nearly enough to make these claims, so I’ll just pose it as suppositional.
What if chant—particularly the lacking-in-any-rhythmic-pulse variety—is really the ghost of Plato in Christian liturgy? Maybe the thing Christians have loved about those wafty chant melodies is how they obscure the beat, leave us with no sense of throb or pulse (like a human heart and its lusty desire to dance), leave us with only notes unencumbered by the rhythm of the blood coursing through our fleshly bodies.
Maybe chant is Platonism and the entrance of metricized settings of Scripture is the triumph of the Incarnation.
Maybe. But, seriously, I could be wrong.