Well, ultimately, to be playing Medic properly, you want to have your paddles out almost constantly. There's almost zero reason to ever be trying to kill someone, unless for some reason you are the last person left alive.I deliberately usually don't. Makes sense in something slower like BF, but the trade off of making it to the next person in time or not being caught off guard is better.
Being able to bring back multiple people, or even more importantly, a Rhino/Fragger, is vastly more important than any other thing a Medic does. By like 100000000%. Bringing them back with full health is even better.