Its basically the two tether system climbing system.
Climbing principle is the same, but no one uses their foot tether as a platform at hunting height. This becomes your platform, so some people will consider that an advantage with one less piece of gear to carry.
I climb with a LWHC and use it as my platform. However, I carry a foot tether as a 2TC backup method if something happened to the LWHC while climbing or hunting. So, I’m not really carrying less gear.
I used to just climb with the LWHC and a rappel rope as my tether, so I didn’t need the 2TC backup system, but I still wanted a foot tether to use as a LB if I need to go around limbs. For me, a regular tether, 2TC backup and LWHC is my most streamlined system (unless I use only bolts).