If you're allowed to say, are you referring to the Windows 10 ports of the iOS apps that were done via Osmeta in 2016, or the earlier WinRT-native version? If the former, that was a non-starter for me and my blind friends due to deep accessibility issues, probably having to do with the Osmeta port/reimplementation of UIKit. Edit to add: And we wanted something that was easier to use with a Windows screen reader than the desktop website, particularly for Facebook proper.