Late Stage Capitalism

I don't think we can call all of the Soviet Union a failure. There were many problems and struggles faced by it, but many of these problems are ones that other AES states have learned from as a lesson, while keeping some of what made it such a progressive movement for the working class to begin with. Free, high quality healthcare, education, and childcare, democratization of the economy and not just government, dramatic reductions in wealth inequality and improvements in production, all showed some of the major benefits of a centrally planned and worker-focused economy.

Of course, it did collapse. It had numerous issues, especially later on as liberal reforms worked against the centrally planned economy. Planning was by hand in an increasingly computerized world, the millitary expenses from the Cold War siphoned resources, the economy was more publicly owned than necessary (Marx believed you need to develop out of private property relations, ie the NEP should have been reintroduced after World War II when Heavy Industry had been developed enough to tackle it), and more.

Overall, we can't simply dismiss it outright, it serves as a very valuable lesson on both good and bad, and anyone building Socialism needs to study it rigorously.