People wanted such mechanisms, which is why democracies formed in the first place, and why medieval societies became a relic of the past.
This is blatantly wrong. First of all, High and Late Middle Ages is when "self-expression and self-determination" really became a thing. Second, oldest democracies formed before those ended by any criterion. Third, a typical modern centralist democracy making citizens equal is hostile to self-expression and self-determination, for the same reason any centralist state is. Fourth, medieval societies became a relic of the past because they couldn't scale as easily as modern ones in terms of state bureaucracy, and thus manpower and firepower.
Even medieval kings needed ideals of honor, chivalry etc. to motivate others to knighthood.
I suggest you read up on that too, because what they called honor and chivalry were pretty specific things, and not "everything good, kind, holy and manly merged".
Now, what this guy is talking about would be a normal political or religious movement in late Antiquity.