Earlier quoted context omitted.
That's a super interesting concept. I will look into it; book ordered! From a quick think through - I think that this argument may fall flat on 2 related ideas. 1. Data shows that when seats are more secure like you say (90-10 instead of 50-50), representatives often go towards the extremes of the political spectrum (on both sides). this leads to issue 2... 2. Voters are generally not strictly partisan - that is to s…
Could this be mitigated by having a system with more than two parties?
Furthermore, American politics isn't two ideologies. Each party is composed of multiple groups that compete for dominance. Republicans have business interests, evangelicals, etc., while democrats have progressives, neoliberal, etc.