With the ability to create campaigns related to different devices, you can modify your campaign structure and bidding strategy to numerous people across multiple devices. This plays a crucial role in determining the success or failure of your ads.
There is a lot of indecision about whether the ads should be displayed either on mobiles or a desktop. With the ability to create device specific campaigns, you are not dependent on a particular method for garnering conversions. Ultimately, you can enhance your conversions in the long run.