Other managed Kubernetes offerings allow you to choose from a list of images to use for your nodes / node pool VMs. This feature should be added to Digital Ocean's managed Kubernetes service. In particular, I would personally like to see CoreOS (https://coreos.com) as an option.
- Consistency. Some people use managed Kubernetes clusters in multiple clouds. For this use case, it would be nice to keep the clusters as similar as possible (for easier maintenance).
- Security. Different base images are composed of different things, and thus have differing security implications. By offering a few image options, the user is empowered to select the best option for their needs.