Another point on the HUD, beyond just knowing other players' tendencies and spotting their leaks, is the ability to analyze your own leaks and fix them. Or, at a minimum, the ability to know your own table image and exploit others' attempts at exploiting you.
Like, if you know that you have 3 bet 20% over 300 hands in this session (super high), expect that all other players using a HUD know this, and you will be getting 4 bet a lot, often by light holdings. Meaning you can 5 bet light and take down some monster pots preflop. Also you would want to make sure to raise your premiums aggressively because you will be getting looked up and/or 4 bet so often. Just one example.