Why the silly hypebole?
Are you really comparing a Mini to a LAPTOP to make your point? Jeez. Cognitive dissonance at its best.
Edit: Let me point out that a MBP consists of 50% battery, which more than makes up for the internal PSU.
But even if I pick up that nonsense:
Maybe you should take a look at the internals of a 15" MBP, which isn't any bigger in size than a Mini. There's the GPU! See!
In a more realistic approach, I could argue that no one, including you, would have cared even the slightest amount of shred if the case were 0.3" higher for a better cooling system and the power consumption 10-15W higher under GPU load. You'd be raving how good the Mini is as a gaming machine now. And that it would all make perfect sense with Steam on the Mac and all...