No charging: The battery lasts for up to years of average use. After the end of its life, send your ring back to us for recycling. Apple hire this man.
they should still have made it rechargeable tbh.
I suppose the problem is that there are no standard for tiny magnetic chargers/cables. Every watch comes with their own, and they need be custom designed. For a device this large as much of the charging electronics should be outside the ring.
And another (small?) problem is that you'd need to electrically protect those external pins.