customize hikashop component

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.2
-- PHP version -- : 5.5

Hi
I was thinking that work on joomla article l lhelp me to understand hikashop but really strange that some field use by joomla article is not use in hikashop for component .

Here an example for joomla article : layout blog where we can override css selector name

Here an example for hiakshop product : product listing . The field is here but nothing appear in the FrontEnd .



I search in all the php file that are use in the FrontEnd page ( under /components) the code <?php echo $this->pageclass_sfx; ?> to see if his variable is use in hikashop php file but not !!
I don't believe what i discover .....Could someone confirm that this vairable we can set in BackEnd is not use by hikashop !!
Is there some Pros and cons about why this field is not use in hikashop but only in all joomla component views !!!

regard's