Those features might appear in a future update, but Wong says she believes the Messenger app and Chats "serve different markets".
Apart from revealing the integrated messaging functionality, the screenshots show a simplified white design of the Facebook app, dialing down on its signature blue accent color. Fast forwarding four years, Facebook has finally chose to reconsider its decision on moving Chats away from the Facebook app.
Having pushed its users to install Messenger on their mobile devices to continue chatting with their contacts, Facebook seems ready to take a big step back, basically returning to its origins.
Engadget reported researcher Jane Manchung Wong found that Facebook could be returning to its old ways through testing. While Messenger became its own standalone app in 2011, Facebook eventually stripped the functionality, forcing people to interact with those annoying chat bubbles that gradually filled up your home screen, multiplying like rabbits. "To give message reactions, make a call, send photos, etc, you'd still have to open the Messenger app".
Wong speculates that the reversal of this policy is in preparation of Facebook integrating its messaging services across all its apps: Messenger, WhatsApp, and Instagram. If all goes according to plan, users may soon be able to access basic features in Messenger and on Facebook with a singular app.
A Facebook spokeswoman said that the company did not have any additional details to share at this time.