[TeMPOraL]

It's an issue of familiarity. I still feel that everything installed by distros' package manager or via "make install" is spewing ick all over /etc, /usr, /var, and God knows where. On Windows, almost everything only ever sticks to a) its installation folder, and b) the registry.

[biktor_gj]

Truth is, Windows is a mess when installing stuff also. Beside installation folder and registry, there is also user's AppData folder, \ProgramData in system drive, and then installers tend to leave some MSIs in \Windows\Installer, all the libraries in System32 and sometimes, they also place stuff in Program Files\Common files.

The best at isolation has historically been macis, and then again you have plenty of packages installing to /Library, kernel extensions, uninstallers being placed in Applications/Utilities, MS updater being placed in /System and so on