An all-in-one distributed databases(relational, columnar, document, graph), object and block storage, event bus, kv-store with consistent high-level APIs and toolings with a focus on DevEx.
For vast majority of Software, you typically need one or some of these. The key is to build all on same unified foundation that allows for intutive ease of use from testing locally without mocking to single instance to distributed fault-tolorant system.
Building them all in rust allows for ease of use embedded and ease of deployment and distrbution for use in other languages.