My experience from my congregation is of that of one sister that was disfellowshipped for adultery in the past and now lives with her now worldly husband, she was reinstated immediately after this new policy came into effect because one of the elders was a close friend of hers and she has never been to a meeting since, so basically she only got herself reinstated so she can see her family again.
In practical terms the issues here must be complex. If this sister is married to some worldly guy and had been out for years, then she must have taken up celebrating Xmas, Easter, birthdays, etc., as well as various other "worldly" customs. Is she suddenly going quit all those things just because she's been reinstated? Hardly likely. No wonder she doesn't attend and thus gather to herself all the social pressure from the diverse sisters who will pry into her personal life and report her unacceptable activities!