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Proportional representation is prone to a grid lock and fragmentation. A ranked choice looks like a good option in the situation when you don't like both major candidates (or parties) and would like to vote for 3rd one but with first-past-the-post you vote will be wasted unless you will vote for one of two the most popular candidates.

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Most of the issue with PR is when your assembly has to select an executive.

But the US has a very powerful executive (the President) which sidesteps the problem. The US House of Reps could be multi party PR without any big issues (well, they might need to switch to a "last year's budget is this year's budge unless we vote to change it" model).

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