Classic A-Cism in either form, anti- or pro-Roman, really believed: "We do these things because they're objectively true." Trading the Prayer Book for copying the church appealed to a higher authority, "the larger church."
There's a difference between that and "this practice fits my religious needs; I happen to think pre-conciliar Catholicism is neat" so I come up with something that looks like it, even better-looking. John's ultimate religious authority becomes John, not God through the church. Protestant private judgment, even if it uses the Tridentine Mass. That's not the church. Also, when the local club becomes just "me and my friends," powered by the supposed warmth of the personalities involved, it's the error of well-meaning liberals such as St. Lydia's. It's not Catholic partly because it's no longer catholic. The parish, one faith for all, vs. the private club, the boutique, even if anyone is welcome to join.
Today's liberal high churchmen are the old anti-Roman party, indeed demonstrating a loyalty to Anglicanism by adopting innovations. Wrong? Sure. But sincere. But their boutique still isn't the church.
The Catholic Church is for saints and sinners alone. For respectable people the Anglican Church will do.Mark Bonocore once said the same thing: Catholic cultures have extreme holiness and extreme evil; Protestant ones favor lukewarmness, mediocrity.
— Oscar Wilde