My impression is that reproducible builds improve your security by helping make it more obvious that packages haven't been tampered with in late stages of the build system.
* Edit, it's quoted in the linked article:
> Jędrzejewski-Szmek said that one of the benefits of reproducible builds was to help detect and mitigate any kind of supply-chain attack on Fedora's builders and allow others to perform independent verification that the package sources match the binaries that are delivered by Fedora.
* Edit, it's quoted in the linked article:
> Jędrzejewski-Szmek said that one of the benefits of reproducible builds was to help detect and mitigate any kind of supply-chain attack on Fedora's builders and allow others to perform independent verification that the package sources match the binaries that are delivered by Fedora.