Agreed. But no matter how big the project and how many other technical people you have around you at some point you must be able to make good decisions, and you can only do that if you understand the information that is filtering up to you.
The role of a manager is to remove hurdles that are stopping the people below them from getting stuff done. If you aren't actually making decisions, or (worse) if you are making decisions without a good understanding of their consequences then you are not removing obstacles; you're being one.
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