It was a business decision for their 2014 models so they could make Atmos available at a lower price point than the other Atmos licensees could.+1
By the way what happened with Onkyo and Audyssey? I see comments about them not having it anymore but my nr808 did. I don't see it on any of the new receivers. Maybe I am way behind I don't know
Quite honestly, nobody really knows and it's a lot of conjecture.
really hard to come to any conclusion and even that would vary by model and year.