They may do that on purpose, however, knowing that a volume spacer can be installed and tuned by the user where as with an air can that is too small, you would have to buy the larger can. Giant probably wanted to flatten out the wheel rate with a larger volume shock and may have overshot the target. Your Giant Reign is built with Maestro, a relatively progressive suspension design. The leverage ratios and rates through the travel in combination with the behavior of the shock are supposed to be optimized by the manufacturer. This suspension rate is why two people with the same shock and weight rarely run the same pressure unless they are on the same bike also. Obviously there is a full spectrum when it comes to that as well. You have to get into the difference between rising rate (progressive) and falling rate (not linear, but opposite of rising).
Basically, it's using a shock to compensate for a suspension geometry of the frame that makes using the full travel of the bike difficult. High volume is supposed to flatten the curve of the wheel rate for an overly progressive suspension design. Sorry for the long winded explanation, I get a little carried away sometimes. It is possible that someone is referring to the volume taken up by an adjustment instead of what is left, in which case less volume TAKEN UP would result in more volume LEFT OVER, thus more linear air spring curve. The smaller volume air can creates a more progressive air spring curve. This now puts all the air at initial pressure into 1/4 as much space.
Piston displacement = 3 in^3 (fixed, same as before) This means that 6 in^3 at initial pressure have now been forced into half the space.
Also, when you change the volume of the can, it takes away (or adds) the same amount regardless of where the piston is in the travel. The piston, which is a fixed diameter and stroke length, displaces the same amount regardless of the amount of air in the air can. You have to look at it in terms of the ratio of the volume at the top of the stroke to the volume at bottom out.
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