The current iMac design feels out of date. A new all-in-one Mac is long overdue.

The current iMac design is positively ancient, by computer design standards. The 27-inch Retina iMac, with its slim design and 5K resolution, was launched in the fall of 2014. It was really only a small tweak on the existing “slim unibody” iMac that dates back to 2012, itself only a thinner version of the unibody iMac design that goes back to 2009.

The basic look and physical features of the iMac have barely changed in a decade.
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https://www.macworld.com/article/3373505/9-imac-improvements-wed-like-to-see.html