It's because you are no longer using Exporter's import. ToolSet takes care of this by doing the import for you, plus it will re-export functions from other modules -- which you'd also have to do in your custom import routine if you want to make, say, Carp functions available when Mod::Personal is used.

You're really just re-implementing ToolSet step-by-step. Here's how ToolSet would work:

package Mod::Personal;

use base 'ToolSet';
ToolSet->set_strict(1);
ToolSet->export(
  'Carp'        => undef,         # get the defaults for Carp
  'List::Util'  => 'shuffle sum', # or specific functions
);

our @Export = qw( phash );

sub phash {
  # your code here
}

1;
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