but for the directory services there is no a way back.
I see, thanks for the explanation. I have no problems in enabling SIDs, but probably, considering it is the only way to get a fully working system, this should have been done automatically by the upgrade scripts in FreeIPA.
I have a blog post in works that tries to summarize the changes that have been done over past few years in this area. It is not complete yet, I'll reference it here once it is published.
Thanks, wonderful idea!
--gianluca