Last I checked, support was missing for the newer ALB load balancer on AWS. That is a hold up for some as the older ELB doesn't scale as well, and needs "pre warming".
Maybe kops should use ALBs for the apiserver, and maybe k8s should support ALB for Services of Type=LoadBalancer. Neither of those are supported at the moment, if they should be then open an issue to discuss. (Even if you're going to contribute support yourself, which is always super-appreciated, it's best to start with an issue to discuss!)
Thought it worth mentioning though, as the older ELB+k8s isn't great, and because the ALB support hasn't shaken out yet, a cluster created with kops could be suboptimal unless you address it afterwards.
I assume once it all shakes out, kops would support whatever the direction is.