So we have a kind of symmetry, I guess.
I'm not surprised.
Basing an attitude toward the development of doctrine that founded it on doubt that God would protect the Catholic Church from error is what I would never want to answer for.
I think you have the wrong church in mind. The catholic church has been protected and preserved throughout the ages, including the Dark Ages which was the zenith of your church's power. Even at the height of Romes power it could not exterminate those Christians that attempted to hold to Scripture as the rule of faith. A remnant always survived.
A great example of how bad it is to have doctrine "develop" over time is the misplaced over emphasis on Mary. As Mary's role "developed" you see her perpetual virginity being promoted as fact. Mary goes from being referred to as "woman" by Jesus to a "suitable vessel" by Ignatius to "Mother of God" by Origen. All this in about a 200 yr period of "development". Now it is a dogma that RC's must believe that Mary was born without sin and was assumed into heaven. Also, she is supposed to be able to hear millions of prayers simultaneously and discern which are worthy of special attention.
I'll stick to what doesn't change, Scripture.
Ijohn 1:3-4 that which we have seen and heard we declare to you, and truly our fellowship is with the Father and with His Son Jesus Christ. And these things we write to you that your joy may be full. (emphasis mine)