Progressive Catholicism has been, is now, and always will be a “problem.” It scares people.
Just during the last 50 years, progressivism has morphed into horrible Catholic liturgy (only recently starting to be corrected), architecture, music, education, art, theology, scripture interpretation, ignoring cannon law, and a few things I don’t have to mention.
And for what? What good has come from progressivism to compensate Catholics in the pews for all the pain from seeing our beloved Church suffer from it? Some parishes were so bad I had to instruct my kids myself. What good has the Church Herself derived? Can there be any doubt that, today, only perhaps 25% of U S Catholics are still orthodox?
Now, if female alter servers were necessary in some case, it wouldn’t be “progressive”; it would be common sense. As it is, however, as far as I know, the Vatican’s recommendation (and just a recommendation) is still to retain as far as possible the tradition of having only male servers. That lessens the opportunity for trouble makers to argue that the Church should allow female priests as well, and lessens the complaints that the Church is no longer the same because it just will not stop changing. So, “one church is as good as another, right? Might as well join one which allows contraception, abortion and remarriage.”