Maybe it's my lack of sleep from staying until until 7am watching election news, but I honestly can't see how this is applicable. My comment was explicit about why the system was set up that way.
> US States are not meaningful cultural units
I very strongly disagree.
The next time you meet a Texan, ask them if they think they are "meaningfully" culturally distinct from Californians.
Having lived in both places I can confidently say "not as much as either party would like to think". There are far, far, far more similarities than differences, especially because the population of either place doesn't tend to interact with their natural environment. Both simply have strong sense of nationalistic pride (however dumb this is).
Texas is a cherry-picked example of one of the states with the strongest specific identities. Most states are not like this.
Ask someone from Phoenix to explain how they are meaningfully different from someone from Denver and they will struggle.
Texas is the one that comes to mind as the strongest, but it's far from unique in that regard. Louisiana pops to mind next. Other examples of states with very strong cultural identities off the top of my head: Oregon, Utah, Tennessee, Florida, West Virginia, Michigan, Maine, Vermont, New York, Illinois... you get the idea.
I'd say about the half the states have a strong, unique identity. The remainder are similar to their neighbors but the farther you travel the more apparent the differences.
Well, yes. The differentiation is both dumb and well-reasoned, depending on your ethics.
However at least germany and austria have meaningfully distinct languages or dialects and many centuries more to marinade in their differences. Texan and californian aren't distinct enough to produce nationalities that are clearly distinct (aside from arbitrary pride!) and they regularly swap populations sufficient enough to provide cultural osmosis that keeps the two cultures tied together.