He's serious, it's https://nylas.com/n1. See https://www.nylas.com/blog/splitting-the-atom (i'm not associated with them)
Can't seem to select all my mail to archive though. I have a bunch of unread mail and I would want to batch read them all.
Also another thing I'm used to in that kind of app, is scroll further than the top limit to update the list.
We've actually considered adding this and just making it a no-op-- a placebo feature to help users transition.