Peer support / mutual aid are important to respond to precarity, and certainly raise resilience (i.e. the ability to undergo potential traumas without being traumatised). You’re right that people who have that are immunised against the worst of precarity – though the network needs to have enough resources overall for it to effectively shield individuals from precarity.
But I do think the idea that it’s “fussy” or “self-absorbed” to take psychology seriously is a denial of the importance of psychological issues… there’s a certain character-armoured type who glorify their own sense of being able to adapt or cope, which is about 50% superiority complex and 50% just-world fallacy. The idea that people should just stop complaining and pull themselves together is the social equivalent of telling people to will themselves to grow back a limb they’ve lost. Who is telling us we should be tough, adaptable, etc etc? This is coming from the capitalists… social Darwinism is one of the ideological correlates of the rise of capitalism. It goes together with the view of people as resources to be exploited and used up, the denial of human needs and desires as a basis for social relations or ethical claims, and in general, a creeping misanthropy which causes a high tolerance for suffering.