In a recent engadget article, Jon Fingas points out the following:
If you're planning to snag the new Mac mini and load it up with aftermarket memory, you may want to reconsider your strategy. Macminicolo owner Brian Stucki (among others) has discovered that the RAM in Apple's latest tiny desktop isn't upgradable, much as you'd expect with the company's laptops and the 21-inch iMac.
(Score: 0) by Anonymous Coward on Monday October 20 2014, @04:53PM
No, I do not expect the 21" Mac to have soldered RAM, so that's a suprise as well.
It's evil. Doubling or quadrupling a computer's RAM has always made it useful.
If soldered memory is a necessarily evil, that's only one I would expect on iPad or the Mac ultrabook, not on desktops.
Maybe they fear the Mac Mini would be too much competition with the Mac Pro (bumping it to 16GB makes it a workstation)