WC Vendors - Notify anyone registering in WooCommerce on Checkout or My Account Page about strong password requirement.

functions.php

OPTION 1 - Add a warning that you need a stronger password.
/* WC Vendors - Add a "Need a strong password" notice to the My Account Page */
add_action( 'woocommerce_register_form', 'wcvendors_notify_password_myaccount' );
function wcvendors_notify_password_myaccount() {
  echo '<strong>Important</strong> -- This site respects your security.  We require all new members to use a strong password.  If you can not click the Register button, <strong>you need a stronger password</a>.<br><br>';
}

/* WC Vendors - Add a "Need a strong password" notice to the Checkout Page */
add_action( 'woocommerce_after_checkout_registration_form', 'wcvendors_notify_password_checkout' );
function wcvendors_notify_password_checkout() {
  echo '<strong>Important</strong> -- This site respects your security.  We require all new members to use a strong password.  If you can not click the Place Order button, <strong>you need a stronger password</a>.';
}

OPTION 2:  Disable the entire password check all together, and allow passwords like abcd1234 to be used.
/* WC Vendors Disable WooCommerce Password Strength Requirement */
function wcvendors_remove_password_strength() {
	  if ( wp_script_is( 'wc-password-strength-meter', 'enqueued' ) ) {
		    wp_dequeue_script( 'wc-password-strength-meter' );
	  }
}
add_action( 'wp_print_scripts', 'wcvendors_remove_password_strength', 100 );