I'm overriding the Luma theme.
I have to edit the product page with 2 changes
1 - insert some attributes in the main of the product
2 - insert all the other attributes in the "details" tab and delete the "more informations" tab
1:
i tried to use to use this solution
https://www.dckap.com/blog/display-custom-attribute-value-product-viewlist-page-magento-2/
and it seemed to work but ... (there is always a but) ... the REVIEWS tab disappears.
why?!?!? 
2:
I tried a lot of solutions but failed ... 
I noticed that any changes I make to my "catalog_product_view.xml" makes the reviews tab disappear ... help me