WE always invent better and better equipment that can do more.
Heck, look at the Medieval times a lot of people think it was just swords and spears and crossbows, etc but the gun was invented around the 11th century, it just didn`t catch on until later, but it did. How about grenades and explosives- they were being used in China pretty early on.
Point is, once we think of it, we usually start trying to invent it. Once invented, we tend not to stop making it better.
It also occurs to me that the Dwemer or Dwarves had such innovations. They even had what we could call robots and automated constructs, but then they suddenly vanished.
All of them- Gone.
Seems to me, that the gods of Tamriel, Skyrim, don`t want mortals building weapons that can shoot and explode.

