I know “proof” is inadequate- couldn’t think of the appropriate word (argument? that doesn’t work either) hence the quote marks.
Which changes/omissions in the prayers do you most object to, if you don’t mind my asking? I don’t want to debate; I’m merely curious. I know I’ve been involved in similar discussions with you; forgive me if I repeat myself.
Personally, (and I know my opinion is not expert) of the major changes I don’t miss the Offertory prayers at all, and I quite frankly
prefer (
especially) the new Confiteor, the new position of the Memorial acclamation, and the responsorial Psalm (definitely prefer a whole Psalm over the Gradual.) I might miss the prayers at the foot of the altar, and the reading of the Last Gospel I can take or leave.
If there’s reasonable ground (and I assume there could be) for thinking that the changes are destructive to the Mass, I would really like to know about it. But a cogent specific explanation is just what I haven’t heard from Traditionalists, even the intelligent and educated like Fr. Z.
I have just read the Von Hildebrand article in your sig. (I have read him before and never cared for him; I like his wife better

.) I’m disappointed- he grieves that prayers have been lost, but doesn’t give any of the (hoped for) specific explanation. I haven’t read the Ignatius book- will have to look it up.