What about the DOCTRINAL declaration of Session 22 of the Council of Trent?
thecounciloftrent.com/ch22.htm
Canon IX.—If anyone saith
(Bolding is mine for easy reading. Quotes were also mashed together from 2 different posts to give better context)
My understanding is that that is a far too strict of a reading of the council. My understanding is that the Doctrine is that the Mass
can be said silently (it would be heresy to say that the Mass must be said out loud), while the
discipline was for the Mass to be said silently at the time. There was nothing there that explicitly forbid an out loud Mass doctrinally speaking. To read that into that pronouncement would be an erroneous interpretation. Like the next one, it is addressed to people who
saith.
The other (vernacular tongue
only) has a similar answer. No one can
say that the Mass should only be in the vernacular. That is actually a very light and non-restrictive pronouncement, because I can easily read that to say that the Church would be fully within that canon even if it only offered vernacular Masses as long as we continue to affirm that non-vernacular Masses are still
allowed and valid. The Canon only addresses “people who
saith” not “people who
doith”.
A similar saith/doith example would be the selling of indulgences. Is it valid (does it work)? Yes, the Church is free to distribute indulgences. Should we do it now? Absolutely not. I fully affirm that it is possible, but it’s still a terrible idea to do it in practice.
The water mixed with wine may border on revealed doctrine anyway (again, as a part of sacramental theology). It’s certainly been discipline for a long time (tidbit: the water to dilute the win actually goes back to 1st century Jewish customs. To drink straight wine was a to a drunkard - to look for a quick drunk - so Jesus would have added water to his wine because they were having a formal - and liturgical - meal. We follow Jesus in not being drunks, so we dilute the wine. The theological aspect of the water and the blood came a little later. It’s another one of our practices that has double meanings).