Motion Warning feature on Selected Units

Not sure if this has been addressed in another post, but just curious why the motion warning feature is only available on select(ed) wireless [pro] cameras, and not on all [pro] cameras. Ex. One hardwired floodlight camera pro has this, but my other (2) plug-in spotlight camera pro(s) do not. It should not have to depend on the type of power supply (battery/plug-in/hardwired/refurbished/brand-new, etc.) units I have. Can someone please explain? These cameras are fully capable of this, and it should not have to be purposefully omitted. Thank you...