One of the standard Catholic objections to Protestantism is the proliferation of denominations. Ironically, enemies of Christianity like Bart Ehrman raise the opposite objection: they allege that the early church suppressed dissent.
This unwittingly draws attention to one of the unappreciated values of sects, schisms, denominations, and even cults. In a theological controversy, you usually have winners and losers. However, this doesn’t mean the losers surrender to the winners, or ride quietly into the sunset.
Quite often, the losers simply break with the establishment and form their own associations. Rival factions. Even if they eventually die out, they generally leave some trace evidence of their passing. Church history is layered with fossils from extinct religious parties.
And one of the fringe benefits of this phenomenon is that it makes it far harder to for massive conspiracy theories like Bart Ehrman’s version of church history to gain traction. The winners have no monopoly on writing or rewriting church history. They can’t erase the record of past dissent.
If, however, Catholics had their way, that would play right into the worst suspicions of the conspiracy theorist. The official version would be the only version. There’d be nothing else to compare it to. You’d have to exercise blind faith in the official, expurgated version of events.