The very last thing I would do is look at what other churches are doing.
Let's be sure of our foundation first.
The BIG PICTURE: Christ sent out ten slaves to do business. One slave proved unfaithful, namely the WTS. They became the evil slave though they had the most cherished position as the temple class. Therefore, what is required of JWs is a separate thing than what might be accepted by the others organizations. You can academically make comparisons but it won't work out toward the actual spiritual reality.
When Christ comes, he sees the corrupt WTS, he does not correct that organization, but simply removes his sheep from that organization in a spiritual sense. He says, "I have other sheep, not of this fold.." So Christ is doing his own thing gathering here and there based upon other criteria than for the witnesses. It's just like the rules for the rest of the world to get saved is not the same as for the Jews. The Jews have some extra things to deal with that comes with their privileges, etc.
So there is no need to worry about formal beliefs and rituals out in Christendom. Jehovah does not recognize formal Christendom. In the Bible Christendom is the 666-Beast coming out of the sea. The WTS is the Lamb-Dragon-False Prophet that comes out of the earth. Both are creatures of Satan and under his influence and both are destroyed in the lake of fire together "while still alive", which means while still actively functioning as a religion. They are thu shut down in some legal way by the UN when BTG is shut down.
JC