Right, but an aluminum mac mini case is the heatsync. So by having the aluminum foot of the Display touching the mac mini, we've just added MORE heatsync for the heat to radiate too and be dissipated. It's like the fins on a CPU heatsync, eventually if the fins are long enough, they will be totally cool at the top since the heat is fully dissipated before it reaches the end of the aluminum.
I guess that's where I am curious. If the case is metal and that's how it gets cooled, then having a metal extension on the top should cool it better, not more, since it's heat conductive. If it was plastic or wood, yeah it would overheat it. But this is like putting a BIGGER heatsync on it.
As far as the weight, as long as it doesn't bend the case, then it shouldn't even matter since the edges of the mac mini case can probably support far more than the monitor weights.
Am I wrong on the idea that by having the metal touch metal, it would increase the cooling since the aluminum draws heat away much better than air does.