Terraform takes a more infrastructure-centric approach and its strength is typically for provisioning infrastructure such as putting up a K8s cluster, etc. than for deploying apps (although you can). Whereas HyScale is aimed at defining higher-level entities in a language that developers understand intuitively without any extra learning curve.
HyScale also aims to reduce the amount of abstraction leakage by dealing with aspects of troubleshooting and runtime operations as well. So this application-centric abstraction enables self-service deployments as well as development on K8s with minimal IT/DevOps intervention.
You can abstract using TF capabilities, they just aren't hidden like HyScale. HCL is widely used, people already use the TF tool, so you end up not having to add more deps and yet another DSL to learn.
HyScale also aims to reduce the amount of abstraction leakage by dealing with aspects of troubleshooting and runtime operations as well. So this application-centric abstraction enables self-service deployments as well as development on K8s with minimal IT/DevOps intervention.
For more, see: https://github.com/hyscale/hyscale/wiki/App-centric-Abstract...