Current state:
Serverless 1.4.0 allows user to install multiple KnativeServing objects in the same namespace with an arbitrary name.
After installing multiple instances of KnativeServing, Serverless applications and routes work as expected. After uninstalling one of KnativeServing instances, the other KnativeServing instance seems to be functional, the Serverless applications are ready, but the knative-serving-ingress namespace gets deleted, so routing does not work anymore.

Maybe we should have the webhook enforce the canonical knative-serving/knative-serving shape for now.

See https://coreos.slack.com/archives/CLUCMK7R6/p1580894960115400 for more information.