Thanks for the response! It is interesting to see the surge in popularity of Zanzibar. Completely agree that Zanzibar itself isn't too difficult to implement (especially since Google published a paper on it). It does provide great flexibility though.

I don't agree with your point that it requires developers to re-architect their systems or that it doesn't handle attribute-based controls well. If anything, I think Zanzibar actually helps developers enforce the best authz practices in their system. This becomes increasingly helpful as an application changes or grows in complexity.

To be clear, Warrant isn't just a Zanzibar implementation. We're building Authz as a service with devxp as the central focus.