Belief 01. Isolation is a capability, not a fear. Deletion you can prove, restore per customer, a region per customer, speed that ignores your neighbors.

Belief 02. Isolation should be invisible. Same API, same drivers, same experience. Security is not a tax on developer experience.

Belief 03. Performance is not a shared resource. One tenant's spike never slows another tenant down.

Belief 04. Untrusted query authors need physical walls. When an AI writes the query, a WHERE clause is a suggestion. An agent cannot talk its way out of a database that contains only its own world.

Belief 05. The unit of data is shrinking. Company, then user, then agent. The future is isolated by default.