True, but there is no evidence that such a system can remain for any significant length of time (or in most cases even come about in the first place) in practic

True, but there is no evidence that such a system can remain for any significant length of time (or in most cases even come about in the first place) in practice. If you look at any country of significant size they mostly appear to be ruled by a committee or an absolute dictator. The committees could be said to generally be doing a bad job but nowhere near as bad as the worst cases of the dictators, but nobody has this ideal system governed by sensible rules - possibly because when you get enough human beings together in the first place they can't agree on what any sensible rules would be.