I heard someone on Issues, Etc or Gottesdienst Crowd say liturgy was a liberal thing in the 70s and 80s.
First of all, these are my thoughts based on experience and third party anecdotes...
To a certain extent, Liturgy may have been associated with "liberalism", but not exclusively. I do believe that "liberal" may have been defined a bit differently.
I know in the 60s there were some Anglican Churches that practiced "closed" communion. These parishes were generally less liturgical and by some called "Low Anglican".
In "Confessional" Lutheranism, I would say things similar, but different at the same time.
Pietism came from a couple different influences; Scandinavian immigrants tended to be pietist (much more legalistic than the German, Slavic, and Alsatian counter-parts. Likewise, Churches that were remote "pioneer" parishes often had to settle for what ever clergy happened to be traveling through for baptisms, weddings, funerals, and even services, and before synods might even call a reformed Pastor to serve their Church. This influence can be seen in some parishes to this day.
Pietist congregations can usually be identified by infrequent communion, an aversion to adult Lutheran beverages, prohibitions to dancing, etc.
Generally, we see pietism present to some degree more in the Midwest and west coast of both Canada and the US; while a higher emphasis to liturgy is often seen in larger cities.
Certainly one can also find more liturgical worship in larger cities among Anglicans as well, but a good example is in my own city; the largest of the three Parishes is very high church; but they are hyper-woke.
Non Confessional Lutherans (most of which are in fellowship with Anglicans and Presbyterians (still scratching my head on that one) are all woke liberals regardless of bells and smells or not. Not all of their members are though.
There can be quite a pietist influence in some of the WELS congregations as well; but again, geography and ethnicity similar to that within the LCMS do come into play as well.