Understand, this is extremely tentative and I'm willing to be told I'm completely off base, but it seems to me that the theories of anarchism are useful for planning what communism may look like, but MLs are much more concerned with the realities of getting there from our current hellstate, and I speculate that the acrimony between the two stems from the anarchist view that to it's counter productive to behave in ways contrary to the way you would act within communism, whereas MLs believe in the dictatorship of the proletariat, the use of state power to enforce the will of the workers over the bourgeoisie in the inevitable transitional struggle to get to FALGSC. In my opinion, we all want the same thing in the end.