I've tried to measure case shoulder or neck stretch due to a dry expander plug but have not found it to be so. And that was with several bottle neck cartridges using mulipule sizers of different brands while working with three or four brands of cases. I do prefer to use mica or graphite powder lubes on necks simply to ease extraction and reduce neck/jacket metal welding over time but that's the only reason I do it.
I can't imagine anyone ever getting a 'stuck case' due to a lack of inside neck lube, case sticking occurs due to a lack of exterior lube, primarily on the thick part down near the head.
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