Degrowth is a popular concept among solarpunks. This Jacobin article discusses some of its flaws from a Marxist standpoint. In particular, Jacobin reminds us an interpretation of Marxism which blames the Western working class for exploiting the Global South, and lectures the ever-more-exploited Western worker on the need to consume less, divides international labor against itself and sabotages its own best hope of success.
Worth mentioning that we need to be aware the degrowth in a degrowth scenario is a global average. Working classes could see growth (in living standards) whilst the whole economy shrunk.
On a lot issues people consistently say the they want the sort of changes (energy) degrowth would provide. We shouldn’t get lost in the current systems deliberate blurring of economic value and living standards.
See for example this work here: https://www.nature.com/articles/s41893-018-0021-4