I got lazy and was sick of remembering or typing namespace and pod names. Enjoy.

get_all_pod_logs.ps1

#!pwsh
$all_pods = kubectl get pods --all-namespaces -o json | ConvertFrom-JSon
ForEach ($pod In $all_pods.items) {
   $ns = $pod.metadata.namespace
   $pod_name = $pod.metadata.name
   ForEach ($container In $pod.spec.containers) {
      $container_name = $container.name
      $file_name = "$($ns)_$($pod_name)_$($container_name).log"
      kubectl -n $ns logs $pod_name -c $container_name | Out-File $file_name
      $file_name
   }
}