I don’t see anything in that that addresses your original complaint. It’s true that most parliamentary systems don’t have the prolonged and extremely expensive campaigns that the U.S. has but that is also irrelevant to the influence of the rich and powerful. You’ve switched goalposts. What country does not have a political system that is inherently dominated by the economic interests you dislike, and how did it achieve it?
This is beyond words. “Too big to fail” was the catchword of 2008, during the Bush administration. There is no - zero - evidence that the Republicans would allow a system in which the Wall Streeters that Evil Captor is so het up about go bankrupt in the numbers that a strict system would require. We lived through it; we saw it; you cannot rewrite history to say that it would have been done differently if the Republicans were in power. They were. Limiting the size of global financial institutions to make them too small to kill the economy if they go under is an interesting proposition but almost certainly unworkable, since that would also make them too small to be the global players they need to be. We live in a “too big to fail” global economy and to the extent that Evil Captor reflects reality neither party can possibly take the steps needed to correct that. A Republican philosophy to let banks fail flatly does not exist; it’s ideological delusion.
Proportional voting and parliamentary systems are in the same boat. They have some interesting theoretical advantages, but also have boatloads of unintended consequences. There’s no good transition plan that anyone has put forward to get from here to there either. The process will be hugely disruptive under the best possible plan; a less than optimal one is disaster in the making.