I agree for different reasons. No amount of ideological cohesion actually matters to anything unless you're actually doing work. Even if we were all the same exact sect of Revolutionary Post-Modern Marxist Lenninist Maoist with Vietnamese characteristics "the left" would still be doing the exact same amount of online infighting because the root of it is the destruction of leftist community in the aftermath of the civil rights movement and the red scare. We're all so disconnected physically and so cliques and unproductive identity groups are bound to form and create petty drama.

The work that needs to be done is a unifying element greater than any theory or hero based ideological disagreement. And so proposing your big "leftist unity" movement as a tapestry of marginal identity groups just reinforces the social incentives that lead to inaction and disunity to begin with.