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Are both a gazebo node and an ignition node needed for gazebo8?

I was looking through the migration document here:

And while it includes a lot of specific information, it doesn't provide much conceptual information. After reading into the code I'm coming to the conclusion that in places where you might historically only need a gazebo::transport::node and gazebo::transport::publisher we may now need a parallel ignition::transport::node and ignition::transport::publisher along side each which seems unfortunate (though perhaps only necessary in transition), but I can't find any specific information to corroborate what I think I've found via inspection.

Are both types of nodes and publishers needed for the time being?

Will gazebo eventually only use one or the other?

Is there another migration document which either guides people through the changed necessary in their code, or explains on a conceptual basis what has changed and will need updating?