Less stuff. Less bulk. Can't see that. Imagine getting rid of the regular key-ring and just attaching a bunch of these new-style keys to one another. See what

Less stuff. Less bulk. Can't see that. Imagine getting rid of the regular key-ring and just attaching a bunch of these new-style keys to one another. See what an unwieldy blob that gives? And about bulk. Excuse me but what kind of key-ring do you carry? Mine weighs all of half a gram or less...