The Ingress API has been on ice for like 5 years. The core Kubernetes API doesn't change that much, at least these days. There's an infinite number of (questionable) add-ons you can deploy in your cluster, and I think that's mostly where folks get stuck in the mud.
But the Gateway API has only been generally available for two years now. And the last time I checked, most managed K8S solutions recommend the Ingress API while Gateway support is still experimental.
They are not retiring the API. Nginx Ingress is one of the many projects that implements this API, and you are free to migrate to another implementation.
