Thank you for writing this posit. I think the degrowth perspective is quite needed in the EA community, which I often feel tends to be too optimistic about the prospects of technological progress improving wellbeing in the medium-run and the negative impacts of climate change on wellbeing and overall societal stability in the medium-run. Facing these challenges, targeted degrowth of certain sectors in developed economies seems like the best response. Especially since a Haber Bosch-style breakthrough doesn't seem likely, or hoping that one does happen seems unreasonable given the stakes.
However, I agree that degrowth doesn't is probably not very tractable. A massive shift in developed countries' political power structures would be required to implement the reductions in profit and redistribution of economic resources that degrowth implies.