If perfected means they put it even where probably there wasn’t a need for it, then yes. HSR is fantastic for connecting big cities, but it’s also very expensive and sometimes China has prioritized HSR rather than regular rail, even though there wasn’t a strict need for very fast expensive trains. Sometimes slower, more frequent and cheaper low speed rail can make more sense.
It’s not bad per se, but it’s money that could be used for better purposes.
Unless you run a VPN