Our whole thing is we want wealth equality but also a little bit of revenge for the centuries of exploitation carried out by the imperialists. It does not help our cause when we say that we want to get rid of peoples cars, animal proteins, generational wealth, etc and that we want the people that have been historically exploiting the rest of humanity should be the first to give up the treats. We cannot expect people to accept their own loss of privilege for the “greater good”, physical force would cost way too much, we need to lie. We need to promote a watered down version of leftism to white men because they benefit from capitalism 9/10 times.
I don't think we have to know certainly what a sustainable world would look like. There could well be a lot of inefficiency in the capitalist system.... Though it might've irreversibly changed the climate already, and might have such a grip on power that things will go nuclear, I don't think it's necessary to decide what a collectivist future has to look like. It'll certainly be better than the capitalist one.
We are going to have to commit a terror worse than capitalism ever did to achieve communism, and capitalism killed like 2.5 billion.