The opposite is true. Being able to dictate an e-mail and proofread it merely enhances productivity. Being able to read and listen the e-mail would enhance the ability to retain the information in the e-mail would involve both hearing and vision lobes of the brain and enhance critical and retention of the information.
Being able to dictate to a computer the size, shape, material type, thickness, and other features of a widget and having it generate a autocad drawing will be a great advancement.
DUmmies are Luddites almost as often as they are liars. The only reason it is almost as often is that they are more than happy to run out for the new I-pad while complaining about Chinese labor.