>> As an aside, the current ingresses (including the Nginx one and Google's own GLB one) all have annoying deficiencies

Agree, this is along the lines of what I meant. For example GCE ingress allows you to reference a global static IP while this is not possible with solely nginx ingress due to limitations with the TCP load balancer. There are separate ingress annotations for GKE/nginx/haproxy, etc. If I want to use the global-static-ip GCE annotation, this will make it a little harder to move to Azure.