Imagine having all that being run by Varnish as the data plane?

Do you think the whole MACH stack users would then move their workload to such a controller/ingress/gateway?

I think they wouldn't, because they don't necessarily understand (or need?) the advantages of caching at scale and flexibility that Varnish provides.

But if you say that you will accelerate everything in their K8s cluster... Then maybe ;)

We'll see. I have a wish for Kubecon in Q4