It might be better to decrease the password strength, instead?

It’s not necessarily advised, but forcing strong passwords on your WooCommerce store can sometimes deter customers from processing their order. For the average person, the strength at which WooCommerce/Wordpress require their passwords to be is above and beyond anything the customer will remember. Personally, I use 1password to generate and store all of my passwords, so this is not an issue for me, but your customers may not be as tech-savvy.

Disabling strong passwords should be done at your own discretion, but until WordPress make the password strength parameters editable, I imagine many people will want to do it. You can add the following code to your theme’s functions.php file.

/**
 * Remove password strength check.
 */
function iconic_remove_password_strength() {
    wp_dequeue_script( 'wc-password-strength-meter' );
}
add_action( 'wp_print_scripts', 'iconic_remove_password_strength', 10 );