That achieves nothing against someone who uses something like apktool/baksmali to do static RE, let alone inject something like Frida to perform dynamic RE. The

That achieves nothing against someone who uses something like apktool/baksmali to do static RE, let alone inject something like Frida to perform dynamic RE. There are even Xposed modules designed to just bypass certificate pinning. Certificate pinning is a good security measure, but not a counter-RE one.