Honestly, I wouldn't mind if they didn't add the +/- for primary/secondary stats if they just had both Info screens showing at once.

Edit: I play on PS3, so I guess idk if they show both screens at once on PC or not. But the only way I can 'compare' gear the way you show on the top screen is if I highlight my worn piece of gear, remember all its stats, and switch to my other piece of gear. I can only see one stat screen at a time.