The key point is that it *only* included 22 of 27. 5 more were still occasionally disputed. They definitely were widely considered scripture by AD 190, but there were some other books that were widely considered scripture, too, within apostolic doctrinally orthodox churches. Among these were the First Epistle of Clement, the Apocalypse of Peter and the Teaching of the Twelve.
The Muratorian fragment considers the Book of Wisdom to be scripture, even though it seems to include it in the New Testament.
The first canon which lists every New Testament book and no other books is that of Athanasius, in AD 367, quickly followed by many others (Rufinus, 380; Epiphanius, 385; Jerome, 390, Augustine, 397; 3rd Council of Carthage, 397; Pope Innocent I, 405)
Another odd thing about citing the Muratorian fragment is that its author is plainly defining the canon not by which books are doctrinally authoritative, but which are fitting to be used in public worship.
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