This definitely needs to be said more. Inking your base at the beginning gives away a HUGE potential advantage (such as control of the middle) for something that can, like you said, be done at any time.
Another thing to keep in mind are special spots on the map that tend to hold strategic value. For example, if you are playing a Krakon Roller, getting a waypoint down deep into the enemy's base is usually much easier if you can rush there. Or, securing a good sniping spot before the enemy team even arrives.
After you die, chances are you are now free to spend a little more time covering your base. What I typically do is spend a couple seconds after each death to hit up a few corners or so before charging back into battle.