Regardless, I do think the past failures of socialist states are very important to consider, as they present concrete evidence for different ways it can go wrong. And I would make the argument that, given all that evidence, it does speak to flaws in the philosophy itself. Because in order for full socialism to occur, it necessitates an authoritarian takeover of the economy by the state. The state is supposed to represent the people, of course, but once they seize power to start managing property and the economy, well, now they're authoritarian bureaucrats with too much power. "Absolute power corrupts absolutely" and all that. To me it's no wonder that dictators take control of socialist states so easily.
Then, even if the state does avoid becoming despotic, you still have to deal with the problem of a centrally planned economy being incredibly inefficient at creating wealth when compared to a capitalist market economy. The adage "you don't make the poor richer, you just make everyone poorer" in regards to full socialism seems pretty spot-on in my observation. Just look at Venezuela for a live example. In 2013 they were hailed as an economic miracle [1] and now, well, we can all see for ourselves how it went [2].
To me, the most prosperous economic model we've come up with is free market capitalism with some government protections in place, like anti-trust and consumer protection laws, and a basic social safety net. I'm open to debate, though. Are there any socialist economies you would point to as a success? What parts of socialist philosophy in particular do you see as being effective and worth pursuing?
1. https://www.salon.com/2013/03/06/hugo_chavezs_economic_mirac...
2. http://www.euronews.com/2018/03/26/colombia-s-venezuelan-mig...