Actually I find that it allows more range of Socialism strains to be discussed. A lot of Marxists tend to look rather poorly at any mixed Socialism blends as either heretical or as liminal states with Communism as a complete end goal instead of being legitimate in their own right.

The PRC is an example of a Socialist Market Economy, it isn’t fully socialized. What Marxists take issue with is Dictatorships of the Bourgeoisie vs Dictatorships of the Proletariat.

Marx may have coined the term

Marx did not coin the term. Marx was simply the most relevant and influential Socialist, and history has proven his ideas to be correct.