Plus,
there is no guarantee that Internet is available during the first boot.
While it should be during install, because any option requiring it is
explicitly advertising the requirement.

Our anaconda already support OEM boot scripts, if avaiable on the ISO.
In particular: oemsystem-boot and oemsystem-default, see:
http://git.sabayon.org/anaconda.git/tree/sabayon/utils.py#n458

1) it is faster, no DVD/CD reading
What's the difference between running stuff off the HD through a
chroot and running the same stuff off the same HD inside a running
system (which is just a chroot)?

2) it can take into account actually being in the installed system
No difference here too... stuff is ran in the target chroot already

3) some Live installation steps would fit better in a post-install
No difference

Some convenient things to implement in a Post-Install fashion could be:
[...]
^^^ No difference.

-- 
Fabio Erculiani

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