I have the same question:

Of course you can do everything with terraform, but that forces development from pipelines as code instead of a visual one. If you start out with terraform, each deployment is done the same way and straightforward, but is in code instead of visual editor. So this is a steep learning curve.

I think getting terraform code from an exiting pipeline would be great, but I am also not sure if that works. Maybe one could build the same an utilize the db cli, but this all seems a lot of effort for something that many projects need.

I have seen projects doing it for Azure Data Factory like this: Edit Pipelines in UI, get Json description, of pipeline, replace/insert environment parameters, deploy arm script to different environment. I am also looking for the most native Databricks way