.Issues like the "right" tempo, articulation, and phrasing depend on the size of the choir, the acoustic environment, and a dozen other factors that are the prerogative of the director
If it is found in the middle of a phrase, however, you don't use the mora vocis or lengthen it.
Try singing Humbly I Adore Thee out of the 1982 with an Episcopalian organist and you'll realize how needed mid-phrase dots are in performance editions.
(This is the same Hymnal that tries to argue with congregations every Advent with it's equal-valued O Come O Come Emmanuel. And don't even get me started on their ridiculous renditions of Of the Father's Love Begotten and Pange Lingua).
I think much of the dot problem points back to how very difficult it is to write rules about specific points of interpretation when giving life and breath to an oral tradition that was not conceived in such a way.
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