No, unplugging a conventional oven to turn it off does not have any negative impact on the oven itself. In fact, it is a safe and effective way to ensure that the oven is completely powered off and not consuming any electricity.
Conventional ovens are designed to be connected to a power source, and they are built with safety features to handle power cycling. When you unplug the oven, it interrupts the power supply, effectively turning it off.
It's worth noting that some ovens may have clock displays or other electronic features that could be reset when you unplug the oven. However, this does not cause any harm to the oven itself, and you can simply reset the clock once you plug it back in.
Unplugging the oven can be useful in situations where you want to ensure that it is completely powered off, such as during extended periods of non-use or when performing maintenance or cleaning tasks. Just make sure to exercise caution when dealing with any electrical appliance and always follow the manufacturer's instructions.