In a popular sci-fi (avoiding spoliers), the alien race has transparent skulls, and their visible thoughts are broadcast to anyone within visual range.
It does seem more efficient than sound.
It does seem more efficient than sound.
You may base64 to spoiler proof it
Few, if any, people who currently have power, would be able to absorb the sheer amount of hitherto hidden distrust or resentment that their subordinates harbor towards them.
Interestingly, there might be two very different end stages.
Either a very open society where people at the top are selected to be non-narcissist and stoic, or a very closed and oppressive society where the absolute ruler is kept in power by a bunch of truly zombified and obedient warriors whose loyalty is real and unshakeable, and who will kill anyone whose brain entertains any rebel ideas too much.