No reason for it, doesn’t actually change anything, forces people to buy a new ID despite having one, especially for domestic it’s particularly meaningless, can’t be used for international so why again?, and then I suspect the chip in it is used to track location wirelessly in airports, gov buildings, and other areas where they have aggressive security, etc - that they probably intend to expand.
I think it’s main purpose is most likely two fold:
Make some money forcing people to buy new IDs, track people’s location better.