It was tried many times, it never worked for exactly 1 same reason over and over again - for all that utopia to actually work sustainably long term, it expects ideal citizens. As in selfless, truly dedicated to society above their own needs, uncorruptable and non-realistic in other ways.

I've seen it personally fail miserably and destroy entire nation's spirit for generations to come (on top of other things destroyed for good).

Needless to say, capitalism with its harshness to laziness and carrot on the stick for hard workers got within 2 generations massively ahead, to the point where Gorbachev didn't believe it wasn't Potemkin village setup when visiting some random grocery store in western Germany and seeing the vast amount of produce and quality available to everybody, on level even he personally could only dream of back home.