This is fine advice, but the topic is the "manager's handbook" not other, better, management practices, so the advice is off-topic. Did you read the section in

This is fine advice, but the topic is the "manager's handbook" not other, better, management practices, so the advice is off-topic. Did you read the section in question? Advice about avoiding zero sum games isn't relevant to a discussion of a specific zero sum game prescribed by the manual we're discussing.