Protestantism has a built-in capacity for course correction, for fixing errors, for refining practice. To put it colloquially, when you get stuck, you can get unstuck. This opens up pathways for catholicity that are closed for those churches that hold their own pronouncements as infallible,
This has much to do with the doctrine of sola scriptura. If scripture is the ultimate authority, you are able to reform according to scripture instead of being stuck with man made error
