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 say (purely as an example), while I may have right leaning thoughts on how to run the economy, I may have left leaning thoughts on social issues. If I'm in a district with someone that is far right or far left, a portion of the time they're always going to vote against my wishes. Am I better off in general? Hard to tell without getting more in depth on my preferences.