Step 5 seems like an uphill battle. I suspect it will be more like, gradual extension of the new standard to support advertiser-beloved features, to the point

Step 5 seems like an uphill battle. I suspect it will be more like, gradual extension of the new standard to support advertiser-beloved features, to the point that the original upsides of the standard are broken, as users have to keep chasing feature support. My earlier comments on this dynamic: https://news.ycombinator.com/item?id=30727672 https://news.ycombinator.com/item?id=30727672