Because in my personal case a majority of users would take smoother scrolling over a small UI bug that doesn't impact the usability of the application which is

Because in my personal case a majority of users would take smoother scrolling over a small UI bug that doesn't impact the usability of the application which is fixable in a few hours at most. Because any websites that need this "blocking events" functionality can opt-in to it quite easily. Because as I explained in my first comment, the breakages didn't affect that many websites, and the sites it did affect were mostly just small UI bugs that didn't impact usability. Yes, some sites were impacted and broken, but they were the extreme minority, and even if you accounted for all of the users of all of those sites I'd be willing to bet that it doesn't come anywhere close to being a "majority" of web users. Hell I'd wager that it's not even close to 1% of web users that were negatively impacted by this change in any way.