Use Heroku, AppEngine, or if in k8s, Knative/Rio.

It's confusing because a lot of people being exposed to K8s don't necessarily know how Linux networking and web servers work. So there is a mix of terminology (services, ingress, ipvs, iptables, etc) and context that may not be understood if you didn't come from running/deploying Linux servers.

The deal was it all abstracted :) And now developers have to start all over with subnet masks?!

The abstraction was file a ticket and let someone figure it out for you, or script it if it happens often enough.