linux distributions do not have full degrees of freedom with regards to their base packaging - there is the implicit limiting factor of the 700 MB ISO file size for standard CDs. to overshoot this would limit adoption mostly to those with dvd burners or those willing to purchase dvd installation disks.
a perl6 distribution should also honor some implicit limit on how large a package size a prospective user should need to deal with in order to get going. i'm not sure what this limit is, but considering that many perl users access the internet using slow and thin connections, the perl6 team should strive to keep this download size as small as possible to allow newish users to learn the language. advanced users already know how to get packages from their OS packaging system or CPAN, there is no need to hand-hold them in this regard.