I can confirm that self-hosted is the best of both worlds: fully private and you control the access through your own infrastructure and all works in the browser. This simplicity is important for many small-medium companies. That is why my go-to tools for adhoc data slicing by non-technical users is https://www.metabase.com. I hope that Airbyte/dbt will be the ELT complement. And I hope to find a way to contribute.