I don't agree that exporting is always preferable to using symbols with prepended package names. If you export a symbol you are simply creating an alias in the importing module's symbol table. Once you do, you have the possibility of colliding with a symbol exported from another module. Fully-qualified names also tell you where a function comes from, which allows the human reader to look it up more easily. It's a tradeoff for typing convenience.

Exports aren't automatically visible across modules, either. To take the OP's example:

package Foo;
use strict;
use base 'Exporter';
@Foo::EXPORT_OK = qw(foo);
 
  
sub foo {
  print "Foo\n";
}
1;

package Bar;
use strict;
use Foo qw(foo);
 
sub bar {
  foo();
  print "Bar\n";
}
1;


 package Something;
 use strict;
 
 use Bar;
 # This call will fail.
 foo();
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