magento2: M2.1.9 : Cannot make all address fields required in customer address edit page (frontend)

I am trying to make all address fields required on the customer address page on the frontend using JavaScript validation, but it does not seem to work. I’m wondering if this is a bug or a feature (I think it tends to be a bug). (related question about this topic on SE)

Preconditions

1. Magento 2.1.9

Steps to reproduce

Edit the section in Magento_Customer/templates/address/edit.phtml (or overwrite it in a theme) that is responsible for rendering the additional address lines:

<?php for ($_i = 1, $_n = $this->helper(\Magento\Customer\Helper\Address::class)->getStreetLines(); $_i < $_n; $_i++): ?>
    <div class="field additional required">
        <label class="label" for="street_<?php /* @escapeNotVerified */ echo $_i+1 ?>">
            <span><?php echo $block->escapeHtml(__('Street ' . $_i)) ?></span>
        </label>
        <div class="control">
            <input placeholder="<?php echo $block->escapeHtml(__('Street ' . $_i)) ?>"
                   type="text"
                   name="street[]"
                   value="<?php echo $this->helper(\Magento\Framework\EscapeHelper::class)->escapeHtmlAttr($block->getStreetLine($_i+1)) ?>"
                   title="<?php  echo $this->helper(\Magento\Framework\EscapeHelper::class)->escapeHtmlAttr(__('Street Address %1', $_i + 1)) ?>"
                   id="street_<?php /* @escapeNotVerified */ echo $_i+1 ?>"
                   class="input-text required-entry">
        </div>
    </div>
<?php endfor; ?>

Note: the only thing I added is the required-entry-class.

Expected result

1. Upon submitting the page should show the JavaScript validation message on all address fields

Actual result

1. The page just submits, even when the additional address fields are empty.