I am old enough to remember when the complaints in society were about rock and roll. And about hill billy music. And about long hair music. There is alwasy someone around who will kvetch and belly ache. That there are those who do so about liturgical muic doesn’t really surprise me. Howeever, I maintain that the majority of people are not complaining; that it is a minority who do. and many of that minority do so indiscriminately; they do so as if things were better in the "old days’. I was there in the “old days” and it was at best a mixed bag.
One of the more hilarious bits is the remarks about Gregorian Chant; Gregorian Chant was not used all that widely before V2, and much of it was poor musically (an much of what I have heard recently is even poorer).
There are cross directions coming out of Rome; on one hand they seem to want chant and polyphony, which is capable of being done correctly only by a choir (and many, if not most choirs should stay out of that arena unless they are simple souls incapable of being embarrased by their lack of talent), and on the other hand they enourage the congregation to sing. And the latter is flatly ignored by the elite group of sophisticates who want something bordering on a concert at Mass.