So is there anything these dots are actually used for?
As noted, they are pogo pins. They make contact with docks typically, and can pass through charging and AUX connection. Makes for much less breakage as there is no stress on the cable ports. That is, if the manufacturer's USE them. The dock for the One X does NOT use them, though my Gnex one did. Once you have used a dock that uses the pogo pins, the rest is a kludge.
Yes. There is a standard OEM desktop cradle that uses them
Sent from my HTC One X+ using Android Central Forums