Great summary on the different roles ACME and SPIFFE play. From the article: "Use ACME for managing certificates in static environments to ensure efficient lifecycle management. Deploy SPIFFE for dynamic environments to provide strong, attested identities for your workloads" - Ryan Hurst
Put some thoughts together on how to think about ACME and SPIFFE. The TL;DR is: ACME is about proving control of an identifier, while SPIFFE is about assigning and managing identifiers dynamically to enable the authorization of the subjects of those identifiers.
Digital Identity Expert
6mointeresting.