Lots of things about US democracy are vaporware. The two-party paradigm and candidate selection in particular are a joke. Repubs various state party orgs eliminated any real primary challenge to Trump. Democrats spiked any meaningful primary challenges to Biden and then installed a replacement who received zero primary votes.
Then we get to “choose” between these arbitrary figures who were selected by elites and nobody really likes.
Don’t forget it also created a 5-10 year period of otherwise-tech-illiterate ditsy chicks with comm or marketing degrees rebranding themselves as “Social Media Marketing Expert”, because they knew what buttons to click in Facebook UI.