There is simply no way the WBTS can afford to follow first century Christianity.
They and their organisation (VISIBLE golden calf) would be revealed as irrelevant at best and evil/apostate at worst.
The WBTS carefully keeps its followers from learning about the Good News according to Paul, Moses, Isaiah and Psalms.
This is quite an impressively evil feat since more than half their own Bible's 152-odd references to "good news" are by Paul.