So what you just said is that you use an inferior DD to DD 90% of the time just because it could tank if the person really tanking isn't tanking.

Who "off tanks" any more? Is this 2006 and we're trying to set up a trick attack or something? Sooner or later good players will not let their tanks die enough to justify your pugilist being there. In fact, they already have.

When that happens, pugilist becomes just a gimp DD. You're probably levelling thaumaturge so you can tank better than pugilist can and DD better than pugilist can.

Either way, with the job you already have (archer) and the job you're going to have (thaumaturge) your pugilist has no point. There are only three jobs in the game. Gladiator, archer, and thaumaturge.