Neither does a home made heating pad come with instructions, and I have read multiple times of heating pads overheating, why do you think they changed the design so much that they will shut off after so much time on.While this may be true, they do not come with instructions, and yes everyone has a right to choose....I don't believe I challenged that. I have, however. read several different threads posted since I joined about fires that were caught just in time and exploding bulbs and so on. Further they cannot be monitored 24/7...unfortunately...
I have used a heat lamp for 20 years brooding chicks and I've never had a single problem. Both systems require some amount of education to use. I certainly can't brood large groups of chicks with a heating pad, I would need multiple ones and my guess is they would all try to get under one pad, and some would become chilled, because it's dark and they can't see to move to another pad, or know to.
It does seem like whenever someone asks a question about a heat lamp they get told to use the heating pad, which negates any educating anyone can do for using a heat lamp. How is anyone suppose to learn when no one will say anything but use the heating pad. My two cents anyways.