So it looks like whoever was in charge of porting reach to the XB1 disabled/hid the population count.
Any idea why?
It didn’t get disabled. It lost functionality quite some time ago…
For clarification, Reach hasn’t been ported to the X1. It’s running under emulation, the work being done by the backwards compatibility team at Microsoft. Reach on the X1 is pretty much the same as Reach on the 360, people playing on both systems can play with each other.