It would hose only your &quot;usermode&quot; apps, which would be a small subset -- likely smaller unpopular apps that lag in the distro repository. The system as a whole would remain intact, so you can logoff and clean up the mess as root. What hack would rely on some specific app being deployed in user-mode anyway? To do what, steal user files it already has access to?<p>It&#x27;s obvious that &quot;usermode&quot; should be the exception and not the norm, but from a security standpoint it&#x27;s exactly the same as compiling and installing with custom prefixes.