They are viable and not profound. They won’t achieve a change to wealth distribution for example. Or the ethics of modern societies. To me these things are a basic baseline. The minimum. And they won’t make meaningful changes, certainly won’t make a dent in degrowth or scratch the surface of the ills of capitalism that you identify…by proxy.
Why communism didn’t succeed is a complex question, and there isn’t one simple reason but of course many. Not least is a centralised economy. How could government run a whole economy with all of the myriad detail? Buying, manufacturing and selling everything from screws to jeans to farming equipment? You need local (greedy) actors to make an economy work well. Civil servants are not hungry or greedy in an entrepreneurial sense (which is what makes an economy tick with efficiency and innovation). Instead the greed shows itself in corruption and kleptocracy.
All that said there are a lot of things that were much more viable within Marxism and even communism, that we should learn from. Within communist societies people did very much believe the n the points you raise below, for example. And there was a greater collective ethic. The rest of the system - economy and elitism of the party - didn’t support the ethics ultimately but they were there. Along with education and many other strong social endeavours.
Couldn’t agree more. As someone once said: if you think education is expensive, try ignorance.