emacs fan help with packaging .el

[Jonathan Underwood]

2009/1/4 Nicolas Mailhot <nicolas.mailhot at laposte.net>:
> The way we handle this for fonts and fontconfig is that the fontconfig
> package runs its magic command on stuff available in special dirs on
> install, and individual packages run the same magic command on
> themselves in post if fontconfig is available.
>
> It's simpler and more robust than triggers.

I am sure you're right, but I'd like to understand why it's more
robust, and more robust against what?

Cheers,
Jonathan.