Backyard chickens are great if you have the space, time, and patience, but they're hardly a solution to systemic issues... The real fix is a more diversified, resilient supply chain... And not just pushing food production onto individuals
Well, I agree with your premise of needing more diverse and resilient food production but I fail to see how backyard chickens (and homegrown vegetables) can't be a part of it.
I say this while I'm also - on principle - extremely wary of pushing systemic change on individuals.