Update block arguemnts in xml file (Recommended way not working)

Question

Magento 2.0.2

File :- vendor/magento/module-catalog/view/frontend/layout/catalog_product_view.xml

block :-

<block class="Magento\Catalog\Block\Product\View\Attributes" name="product.attributes" as="additional" template="product/view/attributes.phtml" group="detailed_info">
  <arguments>
     <argument translate="true" name="title" xsi:type="string">
        More Information
     </argument>
  </arguments>
</block>

I am overwriting this block in my module with same file name like this (by action method) and it is working:-

<referenceBlock name="product.attributes">
    <action method="setTitle">
       <argument name="title" xsi:type="string">Product Details</argument>
    </action>
</referenceBlock>

But when i updated this title by this below method (argument menthod) it is not working:-

<referenceBlock name="product.attributes">
    <arguments>
       <argument name="title" xsi:type="string">Product Details</argument>
    </arguments>
</referenceBlock>

So, my question here is that why it is working by first method, as it is mentioned in documentation that it is not a recommended way to modify block arguments link

Answer 1

Argument method working something like this

<referenceBlock class="Magento\Catalog\Block\Product\View\Attributes" name="product.attributes" as="additional" template="product/view/attributes.phtml" group="detailed_info">
    <arguments>
        <argument name="title" xsi:type="string">Product Details</argument>
    </arguments>
</referenceBlock>