You lost me at the art about Necrons being the guys who beat everyone up. With the newer necron fluff in the 5th ed rules book and blood angle codex, their has been a drive to make the necrons more like the tomb kings. A drive to give the necrons some sort of narrative to them. Well the basic necron warriors are mindless the lords are greedy/cunning/insane/intelligent/ect
Many necrons are now godless after the War in the Heavens, and now are left to their own devices. So basically you have these armies of mindless robots being lead by a lord. How dose the lord feel about his people being turned into necrons? Apathy? Sorrow? Frustration? guilt? Thows kind of questions help give the necrons more character and make them less "faceless".
I would not be surprised if in future fluff the necrons are as likely to fight each other as other races. (Like the Tomb Kings.)
But for them to ditch all of that and go back to the original fluff of them being mindless machines? eehhhh..... Seems odd.