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From the author of uBlock on this:
What we see are the public statements, for public consumption, they are designed to "sell" the changes to the wider public. What we do not see is what is being said in private meetings by officers who get to decide how to optimize the business. So we have to judge not by what is said for public consumption purpose, but by what in effect is being done, or what they plan to do.
This is how personally I see the deprecation of the blocking ability of the webRequest API in manifest v3:
In order for Google Chrome to reach its current user base, it had to support content blockers -- these are the top most popular extensions for any browser. Google strategy has been to find the optimal point between the two goals of growing the user base of Google Chrome and preventing content blockers from harming its business.
The blocking ability of the webRequest API caused Google to yield control of content blocking to content blockers. Now that Google Chrome is the dominant browser, it is in a better position to shift the optimal point between the two goals which benefits Google's primary business.
The deprecation of the blocking ability of the webRequest API is to gain back this control, and to further now instrument and report how web pages are filtered since now the exact filters which are applied to web page is information which will be collectable by Google Chrome.