Many managers should indeed not be in the position to make decisions about these sort of things. Yet they are.
As you mention, they don't respond well to telling them that. Their own managers also don't like the implication that they made a mistake in whom to promote. Since everyone wants to protect their own career, nobody will ever step down or revert such a decision, with predictable results for overall product quality.
As you mention, they don't respond well to telling them that. Their own managers also don't like the implication that they made a mistake in whom to promote. Since everyone wants to protect their own career, nobody will ever step down or revert such a decision, with predictable results for overall product quality.