Who do they think will volunteer to produce the goods and services for salary/wages that will then be given to those who don't want to work? No one. Then the Stalinism comes out into the open, as people must be forced to labor for what they don't get to keep. Then we end up with a soviet Russia style economy, with shoddy goods, poor service, shortages as the rule, etc. I suppose they wouldn't mind that, as long as everyone was equally poor. (Except them, they always somehow consider themselves the "elite" who are exempt from natural consequences).
All this boils down to, like most "equality" and "affirmative action" programs from the left, is a scam and a con at the expense of brighter, smarter, more motivated, harder working people who are able to be reliant upon their own intelligence and industriousness.