I think it's a legitimate worry, but I don't think using our old accounts give us any less protections than throwaway accounts. And I doubt the people that would make such accounts have anything of interest to add to the discussion.
This is contradictory. If it's a legitimate worry, then it's reasonable for reasonable people to want to make such accounts. And reasonable people are exactly those who have things of interest.
From an HNer I'd also expect the understanding that yes, old accounts does give less protections, trivially from an information theory perspective.
