We know delegation can be done badly — the English language has a word to describe bad delegation: micro-management. So why is it that new managers sometimes micro-manage, even when they know it's a bad idea?
From experience, there are really only two possible reasons: first, they're emotionally invested in the work they've just delegate, or second, they find their subordinate's work to be too slow or too lousy when compared to if they were to do the task themselves.
But bad delegation is terrible for your team, and it pays to learn how to delegate well ...