I thought I knew this, but why do I put my use statements inside if/then if it happens at compile time?

use warnings;
use strict;
my $config;
if ($^O eq 'MSWin32') {
    use Win32::TieRegistry( Delimiter=>"/", ArrayValues=>0 );
    # load $config from registry
} else {
    # else load $config from flat files
}
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Too tired to think for myself tonight.