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I believe the OP is talking about LoadBalancer (https://kubernetes.io/docs/tasks/access-application-cluster/...), and I believe you're talking about Ingress (https://kubernetes.io/docs/concepts/services-networking/ingr...).

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It's still an optional, rarely used service config, and does not imply lockin

It's very commonly used by the ingress controllers. You can get things working with hostNetwork or custom service port ranges, but that's a lot rarer than doing it via load balancer.

Third option would be to expose pods directly in the network. EKS does this by default, but from my experience it's quite rare for people to leverage it.

Yes, an ingress resource will typically create a load balancer if you are in the cloud, but not a service resource.

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