The biggest downside of a carousel is that you can’t count on people seeing the information. People often scroll past these large images and miss all of the content within them. This scrolling straight to the content, seems to happen on all display sizes, from a 30 inch widescreen monitor to a 3 inch mobile phone display.
The second downside of a carousel is that you, as the content designer, consider the carousel as a collection of images that tells a story – a set of images that collectively give an accurate impression of what you sell or what you do.
Your visitors often consider just the one image they see. But if they only see one image from the complete collection you designed, they may get an incorrect or incomplete idea about your business.