He's not wrong, but this is a self-sealing argument. If the guy you hired just isn't really rocking the boat, well... it must be because he's not a TRULY GREAT

He's not wrong, but this is a self-sealing argument. If the guy you hired just isn't really rocking the boat, well... it must be because he's not a TRULY GREAT <insert role>. To give a tired example: lawyers, wherein yes, lawyers as a profession is needed and useful and meaningful, but it's also true that they obfuscate unnecessarily and generate make work and so on and so forth. And it's entirely possible that this can come from the same person. You can make the same argument about virtually every single role ever.