For me it isn't important to have many different weapon types, but I very like it to see showing up many different "looks" for any kind of weapon type :
Each sword, spear, mace, bow, dagger, etc ... can have many "looks/faces" that make them "special/unique/your favorite/..." ONLY because of it's from and/or colours, inscriptions, backstory, ....
Let's say you have a favorite NPC or place or whatever and you find a weapon that is 'named as' or 'looks like' you favorite thing ... that would be awesome to use that weapon, even if it isn't that powerful !
And what about making a weapon yourself or set a Enchantment on it ? An Enchantment of one of the "Elemental Forces" (earth, wind, fire, water) to deal special damage or make your hero more resistance to that element via a Shield or armor with that Enchantment ...
But to be short: weapons you can "Enchant" make them even more special/unique !!
I don't know if gear will have "Durability quality" ? But if so , make it possible the player can find/buy a magical enchantment that give (for example) an (almost) unbreakable piece of weapon/equipment
I always loved in DD the special damages on weapons like Mana Leech, Life Leech, Fire/Frost/Lightning/Spiritual/ .. damage !!! Please do this in D:OS in some sort of formula again !!
I know, this is maybe not possible, but it are just MY feelings of nostalgy ...