To be fair, "Web Integrity" (aka remote attestation aka a corporate surveillance agent built into "your" hardware) is much more fundamental as it would prevent the running of forked browsers that remove deliberate security vulnerabilities like IPA. It's unfortunate that Mozilla "plays ball" on garbage like IPA, but at least as things stand users are free to disable/remove/fork/etc. Whereas remote attestation is fundamentally game over for the idea of user representing agents altogether.