As someone who would like to create groups for my friends who might not have VRC+ I would like to give them full oversight over the group and remove myself from it completely so they can trust that I cannot mess with their groups unchecked with full owner rights even if I grant them admin permissions. Currently this does not appear to be possible.
There are also other reasons why one would want to transfer ownership besides just getting around the VRC+ requirement, for example in case a leader steps down. I feel like this should be a possibility.
Right now I'm not sure if admins with full rights can remove owners from the group, but I would assume not.