We should look at the time difference between caching and transferring the thin_archives vs just rebuilding them each time.

even though we switched away from caching linked bins in https://jira.mongodb.org/browse/SERVER-74278, thin archives are still cached: https://jira.mongodb.org/browse/SERVER-33958
thin archives are .a files which just use references to object files, so they are very small. I wonder if the extra number of small files we are transferring is worth what ever savings we get from caching. I would be surprised if there was any significant diff in time between transfer a thin archive vs rebuilding a thin archive.