Child theme requirement

My child theme seems to work okay without this function. Is it really necessary?

function generatepress_child_enqueue_scripts() {
if ( is_rtl() ) {
wp_enqueue_style( 'generatepress-rtl', trailingslashit( get_template_directory_uri() ) . 'rtl.css' );
}
}
add_action( 'wp_enqueue_scripts', 'generatepress_child_enqueue_scripts', 100 );