I think in the USA, pre-existing airports have reduced demand for HSR. The US has airports in almost every city with more than 500k people, while that is definitely not true in China (even still).
Chinese HSR stations can be as inconveniently located as airports, so that isn't much of a benefit. Security is a bit better, they mostly make you put your bag through some sort of X-ray machine that I doubt they are looking at.
> ~1 million people
Here I am in a town of 8k thinking it'd be nice if they finally connect these two bike paths.