> However, in many other installations the roles of end-users and administrator are fundamentally different and will also be impersonated by different people.
In all cases that I know of tools which you need to be root to be useful also safely refuse to run if executed by a non-root user, so there seems little *need* to segregate them.
> In those cases, the distinction between bin and sbin limits "namespace pollution" of tab-completion for normal users, i. e. tab completion will not suggest executables which cannot be executed by non-privileged users anyway.
There are so many binaries in /usr/bin these days that I don't think a few more will make much difference. "Cleaner tab completion for some users" seems like such a tiny gain.
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