Highly recommend to check this out, the blog/Arnoult does an amazing job in very succinctly breaking down the aspects of SBOMs in a Nix based infra approach. We can go way beyond the current SLSA levels and provide full provenance at the atomic level of the supply chain for when it's needed. And as Arnoult points out, prune when it's not.
There's good work being done on this across the Nix ecosystem and we have also seen a lot of use for it come in through Flox as well!