I wish Force Ghosts had never been ‘explained’ (ie “an old friend has come back from the netherworld…etc etc”). That way it would all be ambiguous and we could see it however we wish.
BTW back in '83 I thought Anakin was appearing to Luke in Tatooine farmer apparel (it never occurred to me that Lucas intended Obi Wan’s desert wear to be actual Jedi garb!) - a kind of symbolic return to his pre-Darkside humble beginnings rather than a demonstration of Jedi enlightenment.