Why not triaging confirmed bugs instead of new ones?

[Alberto Salvia Novella]

In the triage guide (http://tinyurl.com/kz4netu) there's a list for 
suggested bugs for being triaged, which basically is one of reports 
being untouched and not confirmed.

Although confirming bugs could be taken into consideration, for triaging 
wouldn't it be better to suggest confirmed bugs instead?

Also it seems to me that shorting bugs with higher heat rather than with 
higher importance could be a good idea for triaging, since you will be 
looking at bugs with higher appearance first in a phase where most bugs 
haven't got any importance set yet.

So the list will be:
<https://launchpad.net/ubuntu/+bugs?field.searchtext=&field.status%3Alist=CONFIRMED&orderby=-heat>

What do you think?