....If you want to be a sub par, or less than optimal tank sure. A tanks primary job is to hold threat. There will always be times leveling up where you need to grab instant threat on a mob. Either the dps goes crazy right at the start on the wrong mob, or an add shows up just as the healer blows a massive AOE heal, or if you die mid fight, but the healer swift cast and rez's you. Without provoke you will never get the mob back in a death scenario, unless the rest of the party also die to reset their threat. Provoke is a necessity from the moment you can obtain it. There is simply no reason not to have it, and ignoring it just tells me that someone is lazy, and that usually means a sub par tank who is poor in his execution in other areas as well. Not having it puts you at such a disadvantage in so many scenarios. In a big fight, if I knew a tank didnt have it, I would elect to replace him if possible.
