Bug#304402: consider moving logs to /var/log/installer?
> * The /var/log/debian-installer/ directory name is confusing to users
> of Debian derivatives when they see it, and it's hard work for
> derivatives to brand it if they choose to because it appears in
> translated messages in the installer and in the manual. As long as
> there's a concrete reason to reorganise stuff anyway, it seems
> useful to make this one neutral. I realise not everyone shares my
> priorities on this one, but it is something that I for one have had
> to put a lot of essentially grunt work into, so I try to free up
> time from that sort of thing to real development where I can. :-)
/var/log/installer thus seems to make more sense.
I don't share your views about this not being a priority for d-i
(taking care of derived distributions). From my own point of view,
this has always been part of D-I goals.