"As cool as this design is, what it does does not add any functionality or utility to the amp."
Well, it looks like you could drop the amp off a bridge, run over it with some trucks, and attack it with a blowtorch, and still have it work fine afterwards, as long as you didn't hit the jacks directly with the blowtorch. That may not be functionality you're interested in, but I think it probably counts as added functionality!
It might LOOK that way, but I suspect it's more likely the opposite is true. If this device landed on a hard surface it would be a very high deceleration, as there is no way for it to deform and absorb the energy. A device of more traditional construction can deform and actually stress the components much less. If the outer case could deform even a few mm on impact (which most consumer plastics would instantly rebound from), that could mean the difference between a 100g deceleration and a 2000g deceleration.
This kind of encapsulation, filling the empty spaces in the device with a thermoset resin, is called "potting", and it's been used for decades to improve the shock, vibration, and impact resistance of electronic circuits. It's true that the actual deceleration experienced by the components is much greater, and potting is not without its problems (a friend of mine told me about a problem he tracked down at his company in the 1970s, where potting in too-hard epoxy caused many of their circuits to fail in the field due to a sort of thermal shock), but it does generally work.
The issue is that acceleration in itself doesn't damage chips, capacitors, resistors, etc. What happens is that the things that hold those components in place — their leads — experience large forces from trying to hold those components in their relative position. Those forces are generally greatly reduced by potting.
There are probably exceptions. It wouldn't be surprising if MEMS gyroscopes and accelerometers were more subject to damage after potting.
Well, it looks like you could drop the amp off a bridge, run over it with some trucks, and attack it with a blowtorch, and still have it work fine afterwards, as long as you didn't hit the jacks directly with the blowtorch. That may not be functionality you're interested in, but I think it probably counts as added functionality!