I never mentioned users having to know things (what you quoted was about the user getting informed whether their system is compromised, which is the job of a secure boot chain). The user being in control means that the user can decide who to trust. The user may end up choosing Google, Apple, Microsoft etc. and it's fine as long as they have a choice. Most users won't even be bothered to choose and that's fine too, but with remote attestation, it's not the user who decides even if they want to. And we don't need random developers looking at our devices to consider them trustworthy, it's none of their business and it's a big mistake to let them.