I have this exact issue with creating duplicate category slugs:
I understand the reasons why WordPress have stopped it - in case you want to move a sub category to another level that already has the same slug and causes a conflict.
But if you have a website with 5 products, and for each of those 5 products you want a sub section of "articles" and "guides", then what would be the preferred solution for the urls?
Ideal, but can't be done apparently:
I think it's lame to have to have:
But good websites need a hierarchy structure, it doesn't make any sense to have:
Just can't decide what to do?