Weapons functioning the same is mostly about playability. A player can learn their character class and then be set, if they find a new weapon they don't have to learn a new class. But if the complexity lies in the weapon it means that every time a characters weapon breaks or they have to use something new, their entire playstyle now changes and they have to learn new rules, that really slows things down and most players aren't that interested in reading about the rules of new things. Even the basic character rules in dnd are said to be too much for newbies.

Having more complex weapon behavior like that works much better in computer games where players can just play without having to understand what things does.