[bichiliad]

Seconding this; The article's talking about a consolidation of the messaging infrastructure, not the product experience. In theory, this could be done with super minor changes to the product code, and in practice, there's nothing stopping Facebook from making arbitrary product changes to WhatsApp anyways.

[gordon_freeman]

The article said to allow users to easily message cross-app. That change to me looks like on the front-end product side.