4K Cable Box

​I have two non-4K cable boxes.  I just got a 4K tv and, via telephone, requested that Xfinity send me a 4K cable box.  The box arrived today, but it is the Xi6-A streaming box.  Is this what the 4K cable box is?  Are live tv channels streamed in 4K rather than through the physical cable coming out of my wall?  I don't need a streaming box to watch Netflix, HBO Max, etc. - it's already on my LG tv (and Xbox Series X).  Is there any point to having this 4K streaming box?​