It seems to me that one of the main selling points of Market Socialism is that once we demokratize workplaces and install a SocDem state over it, the surplus of labor would not longer be extracted by capitalist shareholders while avoiding the inflated bureaucracy and brutal collectivization of Marxist-Leninism. Market Socialists love to point out how people's wages would raise when all the companies profits, which would otherwise end up being outsourced or outflow into the capitalists bank account, would be shared amongst the employees.
The problem is that the abundance of resources and commodities, which is enjoyed by the bourgeoisie, doesn't imply that there would necessarily be an abundance accessible for the proletariat once the profits are distributed amongst them. A rich person would not eat more than three meals a day. Pretty much all their status symbols are merely luxury items which are not needed to improve the welfare of the general population. There would still be the same amount of meat in the store and still the same amount of apartments available the city. While it's true that wages would rise, it would simply lead to an inflation of the currency due to a new influx of money. This can be seen in Yugoslavia, people there today sell notes of 10k dinars to tourists for a dollar because they are so utterly without value.
Market Socialist is anti-Marxist as it is embroidered with outdated proto-liberal ideology by following the logic of profit instead of dismantling it and engage in a detailed analysis of economics. If we really strife for communism, we must realize that only an entirely collectivized production and allocation of commodities under a planned economy will allow us to improve the living standard of all.
The recent popularity of Market Socialism, also on Holla Forums, is caused by the suitability of its ideology to be broken down to simple slogans - like Wolff and his NEP worship - while at the same time creating distance to the Marxist-Leninist states which are painted as evil in Western narratives. Titoist propaganda was perpetuated through the endorsement of Neocons like Thatcher and produced the silly "with a human face" meme. In the end, worship of Market Socialism is defeatism by giving in to Western Propaganda and ignorance among the population towards complex Marxist thought - you may as well just become SocDems.