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PR results do require a shift to consensus and collaborative governing
I don't think that's what these systems generate in practice. It seems more common that unrelated issues are traded off against each other with some kind of tally in the background, leading to a disjointed policy programme.
The experience of the coalition post 2010 in the UK bears that out for me. We didn't get a broad Lib-Con compromise, we got the Con programme with some random goodies like the AV referendum thrown to the Lib Dems.
While not a silver bullet, PR results do require a shift to consensus and collaborative governing. If it comes in it will take a generation of politicians to learn how to work this way and move on from the ingrained adversarial politics we are currently at the depths of. Hopefully will make government/politics far more boring - we could do with that.