There is no comparison between the electoral college, which largely exists only as a formality, and the way intraparty politics work in parliamentary democracies, which in general operate in the least democratic way possible - a set of political elites choose the PM. In a parallel universe, HC is exactly the candidate we'd get in such a system - there's a reason why there were no serious contenders in the primary against Clinton.

You've also not address my points about state and local politics in the US, and the limited power of the Presidency in general that make the position not that all important to the working of the government.