This practice is so widespread--it is done by cardinals, bishops, priests, and deacons--that most of the faithful think these ad-libs are part of the liturgy.
They seem to have no objection, so it will likely continue.
What--someone has to file a formal complaint, notarized and witnessed, time-stamped, with copy served by process-server to get Bishops, Cardinals, and priests to actually do what's required?
I certainly hope that your love of the GIRM (and the other instructions on the Liturgy) preclude you from APPROVING this silliness.