Some things I noticed with a quick test:
- Every item can be returned separately. When excluding the ‘addon products’ from the return center, only the main product can be returned. This is (probably) fine for our case, since the add-ons we use are always free.
- When clicking ‘Buy again’ from the account page, it adds all items to the cart as separate items. The parent relation is no longer used. That could be confusion for the customer, since the account page does show the parent relation.