Mostly because degrowth can mean everything from "maybe we don't need so many funkopops and ads" to "the peasants should learn to subsist on grass", so it is not by itself meaning anything.

It depends a lot on the context. Degrowth in the imperial core? Sure. In the periphery? Hell nah

There was a relatively recent study about the responsibility about climate change that puts the ratio between north / south countries at 9:1, see https://globalinequality.org/responsibility-for-climate-breakdown/ for further references.

Because good degrowth is indistinguishable from socialist five-year plans, and bad degrowth is indistinguishable from austerity. I don't like Saitō, but from what I've read so far from Hickel, his work is worthwhile.