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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