Capitalists need workers to oppress. Without them, they would have nothing to give them a feeling of superiority. Mincing people into fertilizer would surely be a fun pastime for the rich, but it's hardly a sustainable hobby
Capitalists don't care about sustainability.
For the anti-capitalists, I have a genuine question (sorry, I couldn't find an "ask a commie" community):
In the capitalist system there is a movement called Financial Independence Retire Early (FIRE) where people commit to living frugally in an effort to maximize savings and investments. The goal is to achieve a balance that allows you live off a safe withdrawal rate (around 3.5-4%) and then leave the workforce at an earlier than normal age. Some people commit to a life of minimalism and lean-FIRE with under $20k in investment income per year. I believe there is significant overlap with the van-life crowd and other nomadic lifestyles.
Is this lifestyle compatible with, or is there a similar lifestyle within a communist system? To expand, can those with a different set of priorities trade away their later working days in exchange for less material things?