The point is to give people a choice!
If you want to attend the Latin Mass (now, sadly, termed “extraordinary”), then the Church should support it.
If you want to go to a hippy-dippy Kumbaya guitar Mass instead, or to a Mass in a language other than Latin, well, that should be offered, too!
In my town a Protestant congregation ("Living Room Church") is advertising an Easter service for which you are encouraged to wear a costume. Not religious historical garb or anything like that, but a Halloween-type costume and mask for a "wild" Easter ceremony. I suppose that would be OK, also, for you "Choice in Mass liturgy" advocates. Or did you forget the /sarcasm tag?
My own sincere belief is that any change to Mass rubrics since the first half of last century was part of Satan's grand plan to destroy the Church. And in some respects, it worked. Subsequent Popes, to one degree or another, have been semi-willing accomplices of the diabolical scheme, possibly due to naivete and popular delusion fostered by the modernists. The current Papacy demonstrates the first signs of encouragement for a return to correct liturgy and proper culture of the Mass.
“If you want to go to a hippy-dippy Kumbaya guitar Mass instead, or to a Mass in a language other than Latin, well, that should be offered, too!”
Disagree, sorry.
If people go off and do that on their own, then it can’t be helped. But I don’t think the Church should sanction it.