The whole shtick has been - at its core - staying out of loyalty, fealty, and obedience to “God’s Exclusive Earthly Organization”.
But…
…the more they attempt to mainstream, the less grip they have on that claim, because going out of their way to be “seperate” - i.e. different - from Babylon the Great / Satan’s World was an integral part of “proving” that claim.
Once that claim is gone - officially or otherwise - what would be the point in going back?