I don't see the logic in leftist anarchism. The distinction being in the 'social' aspect.

It takes the form of :
"We are going to make a social construct, but it will be peaceful and not do anything against X."

I describe the political landscape here:
https://steemit.com/anarchy/@joesal/power-politics-of-the-left-and-the-right-why-it-matters

I describe/observe problems in Y-axis shifting here:
https://steemit.com/power/@joesal/y-axis-shift

The other problem in leftist anarchism is the tie to :
"...conquest of political power by the proletariat."-The Communist Manifesto

Considering many left anarchists are tied to this form of socialism, they are by default engaged in power politics and not in any type of voluntary social construct.