You mean you've actually seen a deer shot in the spine with "any" bullet not drop on the spot? I know they don't all die immediately, but I've never heard or witness one not drop immediately.
Well I've shot a few others that did all sorts of entertaining DRT arrivals. This, however you want to characterize it, was the strangest occurrence I've witnessed with a neck shot, but it qualifies in every way... did not move one inch, did not buckle and fell over STIFF LEGGED!.
I don't know what you'd call this deer, I called it DRT two miles from the road.
And certainly, the double lung shot is ALWAYS terminal, at some point. With big bullets, its terminal usually within eyesight, some others 300 yards away. If you are competent, have confidence in your shot, and have a big enough bullet, I don't see taking a neck shot as being a bad decision.
Aloha...