They would be useful for reverse engineering for OS. Say you want to find the code that changes a runtime value in a tag. If the code has been found that gets the tag pointer from a tag index, then Halo can be paused at that point, the tag index can be dropped into your program to open the tag in an easy to view way, then the memory address of the intended value can be taken and put into a memory hacking program to place a breakpoint at that memory address to detect the code that changes that value.
Would basically make it a bit easier to find which code manipulates which tags.