For most people, mv3 is "good enough". But that's mostly just random chance. If sites really start taking advantage of the deficiencies in mv3 to push ads, I think Chrome will lose a lot of users. And I think at that point Google will be forced to backtrack and bring back mv2. (Quite contrary to people who think this is just the start of the slippery slope, boiling the frog move to manifest vEvil which will disable adblocking entirely).