Comment 3 for bug 1827717

> Reasoning: Software installed via APT should have defined states, software
> should not be allowed to change itself, unless the user has actively chosen
> to enable such functionality and this functionality points out, for the
> user, that it has this capability.

Normandy won't alter the packages installed by apt (that would mean that it runs as root, which would definitely be a security problem). The mechanism allows Mozilla to roll out preference changes, which will alter only the user's profile.

As you pointed out, this allowed to mitigate quite effectively bug #1827727, which rather advocates for keeping it enabled by default.