Ask all the people burdened down by centuries of corruption how "secure" they felt. The security being discussed here is really that of the leadership to maintain absolute unquestionable control over gullible helpless sheep (Acts 20:29)The idea of periodic reboots to Christian theology, rather than slow, organic development into greater clarity and depth, robs the average believer, who is not a theologian, of any security his church is imparting to him the real teachings of Christ, thus making him vulnerable to competing teachings, and thus stopping God's appointed teachers of being able to fulfill their mission of anchoring the average believer so he will not be blown about by the winds of contrary doctrinal claims.
The doctrine is contrary anyway, when you have the split between the east and west, and the flow of new doctrines -er, "clarifications" by the Western body.
And it doesn't matter how fast or slow it is; change is change, and it is still "the wind of doctrine".
In other words, just let us spread our error and control over everyone, as we redefine the faith; so long as the change is slow and not sudden.The program of the Christian Church must thus be allowed to play itself out to the end. Only in this manner can the accuracy of the results be guaranteed.
Thus today we see heresies like Gnosticism, Arianism, Sabellianism, and polytheism reappearing in the guises of New Age Christianity, the Jehovah's Witnesses, the Oneness Pentecostals, and the Mormons, all of which began as attempts to scrap historic Christian teaching and reboot the system.
You may have kept out Arianism and Sabellianism, but there is plenty of gnostic influence, and even practical polytheism (praying to saints, exaltation of Mary with some wanting her as "Co-redemptrix")
Once again, why not give all this glory to God, instead of to men.