We acknowledge you can use native Meta apps in a standalone way (we discuss this in section 5). The problem is that there aren't many native productivity apps running on Meta.
Or you can install an app launcher which is also stuck in "unknown sources". So you have to find your app launcher and launch that first - which rather cancels out any advantage an app launcher would bring.
It's a huge disadvantage and and makes running sideloaded apps you use regularly a real pain.