Tempting, but not really one of my top 5 AWS tools... Are there other CLIs for other AWS tools that aren't included in the aws-cli? How many are missing here? Is elastic beanstalk even something many people are using anymore given that there was ECS, ECS for K8s, and Fargate? Do those have different CLIs (other than k8s, which seems out of scope)?

Is elastic beanstalk even something many people are using anymore given that there was ECS, ECS for K8s, and Fargate?

I'm most familiar with Beanstalk, but it certainly seems relevant, considering beanstalk can be used as an abstraction to manage an ECS cluster. I know EB is still under active development from AWS, I use it daily. It is indeed a distinct tool from the AWS CLI, offering it's own simplified syntax (one line deployment with git commit && eb deploy), which as you touch on, can also be used to manage an ECS cluster.

TLDR: Maybe it's just me, but this seems like something that would be useful to add.

I'd also find this useful to have, there doesn't seem to be a 'trusted' source for the Elastic Beanstalk CLI, it'd be nice to have one from Mesosphere who are a well known community member. I've forked this repo with this PR to build https://hub.docker.com/r/danielcompton/aws-eb-cli for now.