Thanks for your time...   The power/energy units thing is just college physics-core curricula, and my having been a professional physicist working for the USAF for the last 36 years, I'm likely not misunderstanding anything.  Anyway, as this is heading for a troll-fest, which I wasn't after, I'll just drop a few F-bombs (*facts, haha) then be done with it.

I realized S7's are a better surrogate than S9's for the efficiency of the whole network - S7's have penetrated very far into big mining networks over the last few years as well as individual networks. That way we're only ignoring really inefficient miners like S3-level miners (also, the network total hashing rate varies a bit, but will likely increase for as long as it can).   https://i.imgur.com/vSVL1yA.png