How else would you specify the type of image you would like? Surely, if you were hiring a designer you would provide them with a detailed description of what you wanted. More likely, you would spend a lot of time with them maybe even hours and who knows how many words. For design work specifically to create a first mockup or prototype of a product or image it seems like DALL-E beats that initial phase hands down. It's much easier to type in a description and then choose from a set of images than it is to go back and forth with someone who may take hours or days to create renderings of a few options. I don't think it'll put designers out of work but I do think they'll be using it regularly to boost their productivity.