But “doing the best we can” as humans is not sufficient for Jesus, who wants to lead his Church into “all Truth”. Therefore He placed His Spirit in the Church in such a way as to provide infallible guidance to the faithful, so we won’t get lost.
While this guidance was not explicit gifting to the church (was for apostles and implied for sucessors and cerainly not exclusive towards Catholics), your sentiments are very well worded, and have been understood since the beginning of the church.
What is new, what is coined and claimed peculiarly only by CC, even decreed as infallible, is that she is infallible in matters of faith and morals
Obviously there is nothing explicit in Writ that the Catholic Curch will follow perfect guidance by the Spirit perfectly (on faith and morals), and therefore rests on Tradition, and that being made a capital T by same said CC.(as you see weakness in our splintering, I see weakness at the appearance of self serving authority doctrines :head bishop in Rome,Tradition,infallibility)
So what is missing in your otherwise admirable description of the textual intent, is that the adherence to that perfect guidance is not guaranteed.
What is guaranteed is perfect guidance.
What is not guaranteed is perfect adherence simply because you are recipient of guidance thru an office, and that of only one church, excluding others (O’s and some P’s also with valid apostolic succession).
It used to be early on to cite apostolic authority, then writ authority, then council authority, then bishop of rome authority, then “tradition” authority, and now finally, the latter bishop infallible in matters of faith and morals.
So I can understand the history of frustration of some O’s and P’s who try to argue a specific understanding on a particular point of contention with CC, citing writ , councils even small “t” tradition.
Once those universal authorities have been exhausted in the discussion (writ, councils, fathers), it feels as though the seat of Peter, head bishop/pope, was offered as trump card, and much later, the infallibility of said office (on faith/morals).
I feel the Spirit offers no trump card, is not a respector of position espousers save those that espouse His own view. Otherwise easily sets apart those thru whom the Spirit may bring some light on a matter (making the pope the final arbriter of whom the Spirit has enlightened)
Understand some will fall back on the stumbling 30,000 denoms, therefore how could they possibly fully yield to the Spirit who guides perfectly. I can only use same rebuttals made by catholics when facing their problems, that it is all by grace, and that of course all men are in process of being made to conform, that truth is still truth, even if held by imperfect humans.