PR is worst idea ever. Politics is about Power. In Spain, Greece, Italy and Latin America we vote por parties, not people like USA. We cannot control the parties, they are not accountable. I cannot talk with my representative BECAUSE I HAVE NO REPRESENTATIVE. Proportional Party system is the perfect place for MASIVE corruption
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you have still the choice to create a candidate for your district. The person elected is elected by the people, so he is first accountable to the people, at least afected by the district pressure. "talk to you representative".
In a mulit-party system, where you vote for party instead of people: 1st you have nobody to pressure, the people sitting in the house are elected by the party, not by the people.
There is absolutely no Political representation in a proportional party system. Parties are part of the State, not part of the social society.
In the film "Miss Sloane (2016)" you can see how they organize to win every representative in the senate. In a proportional representative system like Spain, Italy, Latin America this is not needed because ALL POWER rests in the 3 or 4 party leaders, you don't need to win every person in the house, because the house is a FARSE, it is full of puppets under the orders of 3 or 4 party leaders.
US Constitution was designed to combat parties, what the founders called "factions":
"The latent causes of faction are thus sown in the nature of man; and we see them everywhere brought into different degrees of activity, according to the different circumstances of civil society. A zeal for different opinions concerning religion, concerning government, and many other points, as well of speculation as of practice; an attachment to different leaders ambitiously contending for pre-eminence and power; or to persons of other descriptions whose fortunes have been interesting to the human passions, have, in turn, divided mankind into parties, inflamed them with mutual animosity, and rendered them much more disposed to vex and oppress each other than to co-operate for their common good. [..] The inference to which we are brought is, that the CAUSES of faction cannot be removed, and that relief is only to be sought in the means of controlling its EFFECTS"
James Madison, Federalist Papers X.
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US has still the best system. They did copy, they copied the representative system of Great Britain, and then they invented the presidency (the elected king).
Politics is about POWER, politics is a game of power, you have to realize this. And it is the control of power, the control of the authoritarian power of the state the most important part.
You can "feel" represented by a libertarian party but with PR you don't have political representation, you don't have any possible control over a political party. With PR you will have 3 or 4 parties in congress which will be under no control by "the people" they will make laws not "for the people" .. but for themselves. Is that what happens now in the US? it can be really worse with PR.