A little extension off you own logic.
Does it makes sense that, after all the effort that God put in in coming to dwell among us, to fulfill the promise of the true prophets like John the Baptist, that he would then in turn allow his Church to languish for 1800 or so years? Does it makes sense that the record has totally abolished all this new information that Smith has injected? Does it makes sense that all these new concepts were only known to him after 1800 years?
I spent several years in the Orthodox church, a group for whom not only doctrine but history shows a linage back to Paul himself, a time well before Nicea and there is no record of the thing of which Smith spoke of.
Where are the prophets of the past 200 years, the past 500, the past 1000?
Joseph Smith made very few changes, and those are only footnotes in the King James version, which we use.
There is no question that a lot of sacred writings are missing from the Bible. The Bible was assembled by men hundreds of years after Christ died.
There’s also no question that a lot of changes have been made in the earliest sacred writings which did make it into the Bible. Ehrman identified 30,000 changes in the New Testament, alone.
God does things on His own timetable. There were sealed portions of the record that Joseph Smith wasn’t permitted to translated. God will reveal those in His own time.
Even though this premise show a lack of understanding I have one for you where are the prophets between Malachi and Matthew?