The feature flag probably hasn't been flipped through all the Gmail clusters yet, but probably will be soon. EDIT, for more clarity: Gmail spans lots of cluste

The feature flag probably hasn't been flipped through all the Gmail clusters yet, but probably will be soon. EDIT, for more clarity: Gmail spans lots of clusters ("Gmail's web interface runs in many locations”, https://gmail.googleblog.com/2009/09/more-on-todays-gmail-issue.html https://gmail.googleblog.com/2009/09/more-on-todays-gmail-is...) and Google is an US-centric ("5%") company, so it's likely that the rollout has been timed to be complete or mostly complete during the day... US daytime, that is. It's barely 5AM on the East Coast.