Can we please get an inbox in mobile?

I've been using this feature since I have memory because it's handy, you can see all the unread messages in one, scrollable, easy-to-mark-read place.
Why isn't this on Mobile yet? Since some people find it uncomfortable to brow through the UI (and so, so, SO slow), it can solve all those problems, besides having a menu to quickly catch up on your convos while you're outside.

P.S.: Now that I think of that, why is this feature on PC first rather than Mobile? It's an antithesis lol.