From my experience in communist literature, "exchange" in-and-of-itself isn't subject to much critique. Trading goods between friends, family members, or coworkers isn't that big a deal; its part of normal human interactions.
One thing to note is that such exchange is a product of specific circumstances of scarcity. That's why exchange is indeed subjected (or should be) to "critique", but the practical side of it is that the critique can only proceed with the general development of human production under communist social relations (and that development itself is aimed at effective abolition of conditions of scarcity).
On a macroeconomic/logistics level, the cooperation between different regions of the world also isn't something that should take the form of exchange.
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“The possibility of securing for every member of society, by means of socialized production, an existence not only fully sufficient materially, and becoming day by day more full, but an existence guaranteeing to all the free development and exercise of their physical and mental faculties – this possibility is now for the first time here, but it is here.” Friedrich Engels
"The proletariat is its struggle; and its struggles have to this day not led it beyond class society, but deeper into it." Friends of the Classless Society
"Your life is survived by your deeds" - Steve von Till