Rog Xbox Ally Z2

So I’ve been considering getting the Rog Xbox Ally after seeing its recent price drop on Amazon, but I just found out it only works with PC games, not Xbox console titles. It feels strange to call it an Xbox handheld if it can’t play Xbox games, right? I wonder what the reason was behind its release. I mean, why even ship this thing without the ability to play Xbox games? That seems like a must to be called an Xbox. Honestly, it would make a better Steam machine than an Xbox device. I’m so confused about why they launched this under the Xbox name.