This is one for the enthusiast, however, as a review it's very accessible to the non-expert reader. If you want a different perspective than the one I keep presenting about satellite planes, this is the one to go for.
This review summarizes the observational evidence for planes of satellite galaxies in the Local Group and beyond, and provides an overview of how they compare to cosmological simulations. It also discusses scenarios which aim at explaining the coherence of satellite positions and orbits, and why they all are currently unable to satisfactorily resolve the issue.
If you want a caveat, I have to say I think that virtually everything in this is completely wrong. That really demands a blog post [it eventually got one here, though it's quite long] rather than a G+ commentary, but one of my pet hates is the author's insistence on using the passive voice. It gives an impression of aloof impartiality which is woefully misleading. For example when you claim that "the findings have been questioned", you'd better state who did the questioning... because in many cases, it's the author.
https://arxiv.org/abs/1802.02579
Your reservation about passive voice questioning is a very good point, and generally applicable.
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