Mike Horton explains why “semper reformanda” has much more in common with modernity than Protestantism:

Nevertheless, Reformed churches belong to a particular Christian tradition with its own definitions of its faith and practice. We believe that our confessions and catechisms faithfully represent the system of doctrine found in Holy Scripture. We believe that to be Reformed is not only to be biblical; to be biblical is to be Reformed. As important as it is to keep “Reformed” in the phrase, an even more dangerous omission is often found among more liberal Protestants who also leave out the “according to the Word of God” clause. And usually it is “always reforming,” instead of “always being reformed.” In this view, the church is the active party, determining its own doctrine, worship, and discipline in the light of ever-changing cultural contexts. Progressivism becomes an end in itself and the church becomes a mirror of the world.