I'm curious here as well. While they claim for performance improvements, it is a downgrade on many levels. The UI feels like we moved back to 1990. Some of the things that I observed 1. To close the status window you could click on anywhere outside the frame. But now you have to go to that specific 'Done' button. This is like 1990 era design. 2. To go to a specific chat window I could press 'Command + F' and click on 'Command + <number>' to choose the chat window from the search results. It was removed now and you've to use mouse. etc. 3. The message box looks like the 2k's Skype; small, narrow box rounded edge.

Facebook is a garbage company. That probably explains it.

Its actually crazy that they released this app. Did they even try and use it?

I'm using the web version now, installing PWA version.