The Night Scythe and the Ghost Ark are not designed to be played as mech-spam. Far too expensive, and too restricting to the strength of the Necron army, which is the infantry. They are basically support and mobility for a couple of squads while the rest of the army foot-slogs. When 6th drops, this will become the norm across the board; for now, the Necrons are awful as a mech-spam army.
Just because other armies do it, doesn't mean every army with a transport option should do it.
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