The US actually has an additional issue on top of FPTP which as far as I know is unique among (supposed) democracies: a bicameral legislature where one of the houses requires a 60% supermajority to pass anything.
This is such an incredibly fundamental part of the US political system that it amazes me that it isn't more widely talked about. It means the US is effectively not able to pass any laws that are even mildly controversial, because it's the only (supposedly) democratic political system in the world where the opposition party has to consent to any law. This effectively disenfranchises everyone, and is the root cause for the comically over-powerful judiciary and executive (because the legislature is structurally incapable of properly doing its job, the other state organs have to take its place lest the country be completely ungovernable).
For some reason people really don't talk about this issue enough, and continue acting as though the legislature operates as it does in normal democracies, and then getting confused by its behavior. For example, lots of people ask "why doesn't the US ban guns" or "why doesn't the US legalize" abortion, and often just chalk this up to some moral failing of American culture and ideology, rather than recognizing the root cause of the issue: the US can't pass laws, at all, even broadly popular ones!
Given this issue, I feel like the US is best considered a hybrid regime like Hong Kong than an actual democracy. Although at least in Hong Kong, someone is in charge...