Thank you all for the replies.

@Josh Smeaton 
Essentially yes; specifically I was wondering whether I was failing to 
consider behaviour that couldn't be modeled via a Q object, since as you 
mention the current 
https://docs.djangoproject.com/en/2.0/topics/db/queries/#spanning-multi-valued-relationships
 documentation 
uses AND vs OR to justify the behaviour.

@Marten Kenbeek
Got it. Thank you sincerely for the example. I feel a bit foolish now it's 
clicked as I realize the documentation says nearly the same thing, but for 
some reason even after reading through the spanning multi-valued 
relationship documentation multiple times I was completely missing the 
point. 

So would I be correct in stating that all the reported weirdness with 
objects appearing multiple times in QuerySets is mostly a side effect of 
implementing the AND condition on *any* related objects?  

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