

Increasing productivity of workers is met with demand for more production-intensive products. It’s like how every time hardware improves, software becomes more complex to take advantage of that increased capability. It’s like Jevon’s Paradox, but applied to productivity of workers.
One prominent example: our farmers are more productive than ever. So we move up the value chain, and have farmers growing more luxury crops that aren’t actually necessary for sustenance. We overproduce grains and legumes, and then feed them to animals to raise meat. We were so productive with different types of produce that we decided to go on hard mode and create just-in-time supply chains for multiple cultivars so that supermarkets sell dozens of types of fresh apples, tomatoes, potatoes, onions, etc., and end up eating much more fresh produce of diverse varieties compared to our parents and grandparents, who may have relied more heavily on frozen or canned produce, with limited variety.
The American political system was designed for weak parties, and geographical representation above all, in a political climate where there were significant cultural differences between regions.
The last time we updated the core rules around districting (435 seats divided as closely to proportionally as possible among the states, with all states being guaranteed at least one seat, in single member districts) was in 1929, when we had a relatively weak federal government, very weak political parties, before the rise of broadcasting (much less national broadcasting, or national television, or cable TV networks, or universal phone service, or internet, or social media). We had 48 states. The population was about 120 million, and a substantial number of citizens didn’t actually speak English at home.
And so it was the vote for the person that was the norm. Plenty of people could and did “switch parties” to vote for the candidate they liked most. Parties couldn’t expel politicians they didn’t like, so most political issues weren’t actually staked out by party line.
But now, we have national parties where even local school governance issues look to the national parties for guidance. And now the parties are strong, where an elected representative is basically powerless to resist even their own party’s agenda. And a bunch of subjects that weren’t partisan have become partisan. All while affiliations with other categories have weakened: fewer ethnic or religious enclaves, less self identity with place of birth, more cultural homogenization between regions, etc.
So it makes sense to switch to a party-based system, with multi member districts and multiple parties. But that isn’t what we have now, and neither side wants to give up the resources and infrastructure they’ve set up to give themselves an advantage in the current system.