One thing I’ve noticed with managers, particularly new managers, is that they are excellent at coming up with reasons to not delegate. It really is a skill that no one taught them, but they have somehow managed to master.
The thing is, almost every one of those reasons is a bad one. It makes them less effective, it makes their team less productive, and it hampers the development of everyone on the team, including themselves.
Delegation has the following benefits:
It uses resources wisely. Managers make more money that the people on their teams (usually). If a manager does something that someone else could do, it is a waste of money.
It frees the manager to focus on important tasks. Everyone has more tasks than time. The goal is to use your time on the most important things. Delegation helps with that.
It develops people. If a manager gives some things to the other people on the team through delegation, they learn new skills and develop in their roles.