Yes, Parecon explicitly adds ideas which are apparently lacking from Marxism. Parecon advocates claim that you can have nicely democratic systems, consistent with what famous 19th century philosophers like Marx claim, but still have strong institutional tendencies towards repressive authoritarianism and hierarchy. We can wish that the system will stay democratic, but will it?
This is not new. In the first issue of Monthly Review back in 1949, a commentator (Einstein) asked:
"Nevertheless, it is necessary to remember that a planned economy
is not yet socialism. A planned economy as such may be accompanied
by the complete enslavement of the individual. The achievement of
socialism requires the solution of some extremely difficult
socio-political problems: how is it possible, in view of the
far-reaching centralization of political and economic power, to
prevent bureaucracy from becoming all-powerful and overweening?
How can the rights of the individual be protected and therewith a
democratic counterweight to the power of bureaucracy be assured?"
http://www.monthlyreview.org/598einst.htm
(Of course, Parecon may very well have such holes. In fact, Michael Albert teaches "radical theory," [1] which explains that any such social model inevitably has missing concepts. Absent some crazy revolution in our understanding of the world. People who fall into the trap of economism will unnecessarily cripple their worldview, in spite of whatever profound insights they may have.)
I agree that coordination is obviously necessary, but that's distinct from the notion of a coordinator economic class -- which by (their) definition has areas of antagonism with other classes, has the incentive to monopolize empowering work, etc.
I currently believe that an economic theory without the notion of a coordinator class is too weak for my uses. Because it just pops up in the real world too often.
Tayssir
[1] http://www.zmag.org/instructionals/rtinstruc/id2.htm There's also audio versions of a class he taught, maybe at OneBigTorrent or somewhere.