I wonder if some of the abuses we see today in the Liturgy would not happen if some of the instructions and documents would been more precise.
This thought came to mind the other day when I was re-reading REDMPTIONIS SACRAMENTUM my example comes from this intruction.
#102 The chalice should not be ministered to lay members of Christ’s faithful where there is such a large number of communicants that it is difficult to gauge the amount of wine for the Eucharist and there is danger that “more than a reasonable quantitiy of the Blood of Christ remain to be consumed at the end of the celebration.”
It seems like if the instruction listed concrete numbers like say 150-200 . I personally feel that using words like reasonable is open game for personal interpretation.