I was going to post "Why stop at 2 items when you can make it 4 or so?", but then I remembered that the more 3D items you have active, the more polygons would be loaded in the game.
Why is this a problem? the more polygons the game has to render, the more resources and power it requires from the system aka more memory or even CPU power at rare occasions.

So it really is possible to recode the 3D object loading system to make it so it loads JOINTS and BODY PART instead of only JOINTS, as that is what it is now, thus you can have up to 42 items per one body or just the plain old 1 item per body and two items on the head. The downside is that it requires the Item Forgers to re-position the models and upload them again with the different attributes[lets say face instead of the joint, as the center would be focused on the middle of the "Face" part, not the middle of the Neck joint, can make it simple in an another post] and it might cause lag, so it needs further testing between the devs if they ever feel to implement this idea into the game.

Neutral for now.