Ad blockers will no longer be able to have granular and complete control over requests. Extensions will still be able to observe requests, but not edit them on the fly based on advanced and dynamic criteria.

Extensions will no longer be able to neutralize all current and future evasion techniques the advertising and tracking industry implements. Ad blocking and tracking protection extensions will be forced to degrade technologically by about 5 years, and then stagnate.

Ah, I see. I was still somehow under the impression that adblockers worked by hiding HTML tags :D.