What is the great harm about speculating about what socialism or more accurately full communism might be like? It is what (should) motivate us after all.

Although I did think speculating in detail about the future socialist (communist) society was a point of division between the Clapham SPGB and the Ashbourne Court SPGB.

The latter (more traditional SPGB) argue that socialist society should be a matter for those who actually create and live in it and were strongly against the "revisionists" such as Pieter Lawrence in the Clapham SPGB who wrote in detail about "practical socialism."