The new 2014 Mac Mini took a step back from the 2012 model in terms of its limited internal upgradeability. RAM is now soldered onto the Mac Mini’s motherboard, forcing users to consider their upgrade choices at the time of purchase. One of my friends purchased a 2012 model a week before the 2014 model shipped. I advised him to keep the 2012 model and forgo the “upgrade” since the 2012 model can still be user upgraded (both RAM and storage). In my view, there was no rational reason for Apple to seal the 2014 Mac Mini as the form factor between both models is largely unchanged.
Bonehead move, Apple.