Everyone suspected it for a while. Their active Twitter account refused for months to say when the app would be updated for the iPhone X. Personally, I suspect that they painted themselves into a bit of a corner with the tech stack they choose for Inbox. They used a unique C++ to JS compiler to run Inbox in the browser. This worked decently well in Chrome, but the experience in other browsers has been a lot choppier.…
I would love to read some reasoning behind that. I'm really trying to come up with pro arguments but can't.