Obviously what triggers this reflection are the guns and gunpowder. It's the fact that you can apparently use some of those laws of physics that are usually ignored in Medieval or most ancient times fantasy.
They mainly introduced guns to further distinguish themselves from traditional fantasy settings (guns are only one part of the larger effort of course).
Before we start : I am aware we are still centuries away from Modern technology. I know the guns are still primitive and their use very specific.
Now this potentially opens the way for further technological improvement, and mayb