Not using beta ingress was probably a non-starter for a lot of people, since it was the only option for 4 years.

Then there was an upgrade process that required a fair amount coordination between when you changed your manifests, when you upgraded your cluster and when you upgraded your ingress controller.

PodSecurityPolicies also gained a lot of traction and didn’t really have an alternative before it was deprecated.

Also, custom operators don’t all subscribe to the don’t break non-beta resources in the same way core does.