There are no inherent disadvantages in having or using an input device. As a matter of fact, there simply aren't any alternatives, so it would be largely irrelevant, anyway.
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The disadvantages of input devices include potential hardware failures leading to malfunction or loss of functionality, susceptibility to wear and tear over time, and limitations in terms of the types of input they can accept. Additionally, input devices can introduce security vulnerabilities if not properly secured, such as keyloggers capturing sensitive information. Finally, input devices can also be a source of ergonomic issues if not designed with user comfort and usability in mind.
Input Devices provide input signals to Computing devices. There can be disadvantages for a particular type of Input Device such as Mouse, Keyboard, Pointers etc. Nonetheless without Input devices Computer might not be able to receive information & remain useless.
Advantages and disadvantagesv of input devices
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input devices put information in your computer and output devices give out info.Here is a more "elaborate" answer.Input Devices:KeyboardMouseStylusScannerDigital CameraOutput Devices:MonitorPrinterSpeakersKyeboard