Moreover, you're right to identify cultural problems, which are pernicious. I don't know how to solve them but to seek procedural change or technical change, which can help engender new behaviour. Behavioural change is really hard in the absence of any kind of alteration to the incentive structure. A parallel chamber is not a panacea. It doesn't resolve the myriad issues you've identified, which are also a concern to us. This is one of any number of things that we're prepared to throw our support behind when it's under contemplation.
I think it's particularly true in Westminster that this is seen as one piece of a broader reform agenda over the course of about 15 years, which has undeniably produced behavioural change and independence. Does the creation of a parallel chamber resolve partisanship or fear of the whip? I don't think so, but I don't know how you would do that in the absence of institutional experimentation.