Some of us called that out as a slippery slope leading to ubiquitous gatekeeping, but we were shouted down in the name of (as usual) "security."
"That is because without Web Integrity, there is no guarantee that the site requested is being delivered as the site intends. For example, a browser extension could remove ads or modify content on the page."
See where this slippery slope is heading? We DO NOT want what "the site intends". We want to be in control of the content we consume.