It sounds like the title implicates the other libraries that didn't make this short list, that they (in general) do suck.

This isn't a bad thing: https://paragonie.com/security

The intersection between PHP developers, cryptographers, and software security experts is very minimal. Thus, despite PHP powering over 80% of the Internet, the truly reliable cryptography libraries written in PHP are exceedingly rare.

But PHP sucks so much, why bother? :p