Personally, I think that this is closer to what No. 117 of Sacrosanctum Concillium called for than what ended up as the Graduale Simplex.
I too think that this is really what SC 117 called for.
you might find it useful to compare with a "corrected version" like the Cistercian gradual (which oughtn't to be confused with a Corrected Version, like the Graduale Novum), where the modal mixtures have been "corrected".
…if one started with the Simplex with the idea of graduating to the Romanum that day would never come.
Even if the Simplex was intended to be a complete substitute for the Romanum it fails there …
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