I don't think it would create much more diversity, it would just become "stack more damage most optimally"
The way to create diversity (IMO) is to have more ways to achieve the same power but in different ways or play styles.
I totally agree. I mean, we have the left ring and the right ring, but where's the nose ring? Also, we've got boots, but no socks. Where are all the socks?
Agreed them bras and underpants have been doing nothing for years now.