iMac’s design is somewhat long in the tooth. Jack knows why it won’t change:
Apple might be able to make it thinner and lighter, but it sits on a desktop all day, so who cares? The Retina 5K display is best of breed, so an 8K display would be an attractive update, but at what price? Storage options? The entry-level iMacs come with a hard disk drive. How quaint. More expensive models use a fusion drive which combines an SSD with a hard disk drive, but that’s just to keep the price tag low.
Apple just doesn’t have a good reason to upgrade iMacs. What’s better?