I think they should focus more on signing structured data and indexes so people can just exchange IA content however they like and know it hasn't been tampered

I think they should focus more on signing structured data and indexes so people can just exchange IA content however they like and know it hasn't been tampered with. There's not much a state will be able to do as long as they rotate keys, etc, so there are just state demanded revocations which can be ignored.