Hey, cool! Offline mode!
Oh, wait, I’ve had that available since 1986 when I got my first email address. That’s because I use a non-shit desktop client that allows me to do productive things whenever I want to. I know that many people — including friends of mine — find Gmail useful and even good. But all I see are its huge limitations. This removes one limitation, so that’s something I guess.
But still, I had “offline mode” for 32 years before Google thought anyone needed it.