PCWSTR 和 LPCWSTR 之所以同时存在，是因为在古代是有区别的.LPCWSTR 曾经是 const WCHAR FAR *.

More specifically, why is the same thing typedef'd with multiple different names in many cases, and why typedef pointer types (obscuring logic at times)?

For example:

typedef const WCHAR *LPCWSTR, *PCWSTR;

What is the point of that?

The reason there is both PCWSTR and LPCWSTR is that in ancient times there was a difference. LPCWSTR used to be const WCHAR FAR *.