The browser and extensions are made by different people. It makes sense to want to give different people different amounts of permission. If we could choose between a reality where both the ad blocker and ad blocker extention creator had access to your browsing history or a reality where only the browser did don't you see how it would be better to live in the second reality if the adblocker worked just as well? Similarly for seeing requests we can make it even more granular than just the browser. For example if someone exploits the V8 JIT and gains code execution in a tab it shouldn't be able to see the requests being made in another tab.
Consisting of multiple parts "made by different people" describes virtually every piece of desktop software.
> If we could choose between a reality where both the ad blocker and ad blocker extention creator had access to your browsing history or a reality where only the browser did don't you see how it would be better to live in the second reality if the adblocker worked just as well?
No. My agent is uBlock Origin with a very large dependency attached (Firefox). The value of your proposition is null.
Your response amounts to a form of begging the question, anyway.
