The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Uninstalling FAF Client leaves Steam in a broken state
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Uninstalling from Steam also doesn't work.
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Deleting
C:\Program Files (x86)\Steam\appcache\appinfo.vdf
and restarting Steam seems to have worked. Perhaps the FAF Uninstaller can detect if Steam is open and suggest that the user closes it before proceeding. -
Im not sure if it’s FAF related? Maybe you deleted your supcom files as well? Don’t know how FAF would break steam, has never done it for me in 2 years