Don't Install If You Use Samsung DeX w/ a Third Party Dock
It was only a matter of time before Samsung locked down this feature.
According to Samsung Galaxy S8 users on the latest Android 8.0 beta, the new version blocks the use of third-party docks with Samsung DeX.
Galaxy S8 users on the latest Android 8.0 beta connecting devices to these docks no longer get the full Samsung DeX UI experience. Instead, they see a mirror of their smartphone display.
Those who wish to continue getting the full DeX experience need to stay put on Android 7.0 or upgrade to an expensive first-party dock.