Yes, it is absolutely more limited. That, single-IP load balancers, and no direct equivalent of VPCs spring to mind as the biggest differences. AWS still makes a lot of sense in a lot of cases. It is worth noting DO has a decent API, so if wouldn't be _that_ hard to implement autoscaling yourself if you needed it.
[1] https://www.digitalocean.com/docs/kubernetes/how-to/autoscal...