>> Then in the 1400s, was the Roman church just fine with the common man reading the Bible on his own? <<
Yes. That’s why there was a bible on public display in every church. Now, it’s true that these were almost all in Latin, but at the time, anyone who could read did so in Latin, not the vernacular. Vernacular writing was mostly used solely for recording verbal communication.
Actually in England, it was highly illegal—a death penalty offence, to have the bible in the vernacular—which is why Wycliff’s followers, the Lollards, (who influenced Hus) were severely persecuted.
Such persecution for vernacular bibles was not universal in Europe it is true—but in English history, it was very true.
In fact, Henry VIII—yes the one who broke with Rome—had the translater of the 1st English bible translated from Greek and Hebrew, one William Tyndale, executed in Belgium no less, where he was in hiding—for the “crime” of translating the bible.