Omit duplicate products in Related products/Customers who also bought(view) sections
Its possible that "Customers also bought" and "Customers who viewed this product also viewed" and "related products" list the same products. Therefore it looks like the page is filled with repeating the same products. This is wasting space and should not be a designed behaviour.
Also, this extends to category pages where Bestsellers can list, and then directly below, can be the same set of 5 products in the products section.
There should at least be an option where the duplicate products can be omitted.