Hi, so our Databricks contact just assured us the following, after we asked about this issue:
Databricks is officially (but wonโt be GA in every region till end of July) 100% Serverless OPTIONAL.
We understand many of our customers have begged for 100% serverless for a long time now, but others may want or need to keep the classic compute in place.
Every company can use both and will be able to select either or at all times. There is no plane to sunset the classic compute model and there is no plane for it to be regarded as legacy in any way.
We simply want to give companies options. Having the Serverless option can also be a good extra step for preventing VM outages in your Azure region for example.
Hope this helps explain that specific product announcement.