That was a more recent invention of the use of that terminology that became used after the Protestant Reformation. If you think any differently, maybe post some evidence that it was used after the rise of Constantine but before the Protestant Reformation.
The apostasy involved those outside of the fold of the Church of the apostles or from those who left the fold in regards to some who were going against what the Church taught, namely what became known as "heresies" in English.
Since it was the Church that chose the canon we use, and since that was not done until the 4th century, it's rather ironic that some use that same exact canon and yet claim the Church fell into apostasy. The canon simply did not choose itself, especially since there was "lively debate" over several of the books, including Hebrews and Revelation.
I would put the Protestant Reformation in our day or time frame, and since Revelation was Not written for the first century but for our times - Revelation 1:10 - then in that sense the terminology is for our time period.
Remember even Daniel did Not know what would be revealed til later as per Daniel 12:9,4.
I am curious why you mentioned Hebrews. Hebrews is compatible with the rest of Scripture.
Revelation gives us the happy climax to Genesis because at Revelation 22:2 mankind will see the return of the Genesis ' Tree of Life ' for the healing of earth's nations under Messiah's coming governmental rule.
I find Bible canon was completed by the end of the first century. No need for a lively debate at that time.
The first-century writings were regarded as reliable giving us the Christian Scriptures as they are today.
So, Bible canon was established early on the stage, so the ' church ' did Not have to establish it, but merely testify as to what was already accepted by the end of the first century.
Ancient manuscripts support Bible canon as it is today. What Constantine did was to create a blending or mixing of non-biblical pagan ideas with Scripture thus creating ' Christendom '.
Christendom or 'so-called Christian' but mostly in name only because Christendom often teaches customs or traditions outside of Scripture but teaches them as being Scripture.
The present modern religious system of things is often out of harmony with the '66' books of Bible canon.
The apocryphal books simply exclude themselves because they are out of harmony with the harmonious '66'.