It’s no wonder glass hobs are popular alternatives to open electric burners: they’re much nicer on the eye and easier to clean. But if you plan to cook with a cast iron skillet, you might have a rude awakening. Iron is heavy, rough, and abrasive, and glass is prone to scratching, chipping, or cracking from these kinds of things. If you are concerned about handling something large and heavy due to arm injury or weakness and you have a glass pan, beware of the tripping hazard from cast iron.
It certainly seems like a bad idea to put a heavy metal pan on a flimsy sheet of glass, but it can be done with care. Cast iron should be cleaned thoroughly to remove potentially scorching stains on the glass stove. To avoid scratches, never push or pull the pan along the stove surface; always pick up the cast and set it down carefully when it needs to be moved.
Also keep in mind that compared to your standard gas stove, glass pans are relatively slow to release heat due to poor heat conduction (via Hunker). Considering how long it takes to bring a cast iron skillet up to temperature, you may have spent a long night cooking.