> I also don’t think parliaments around the world should be filled with people who chose between being high rate lawyers or business leaders and holding public office.

I think that the people I pay to write laws and run a large organization should have...substantial understanding and skill concerning the relation of the structure and content of law to it's pragmatic effects and the practicalities of running large organizations.

Why would I want anything else?

Do I want more diversity of choices? Sure, I want diversity of meaningful policy preference options that would result from having an electoral system that favored proportionality (which is pretty much the best pragmatic definition of representative democracy) rather than duopoly.