Well, the Xbone's hardware is pretty weak today (I have Linux on PS4, and the performance is very close to R9 260... Xbone have almost same hardware).
XBSX is more interesting because of his 8C/16T Ryzen APU (AMD 4800U like) and RDNA2 GPU (52 CU, so it's more like RX 6700/XT equivalent).
If we could install Linux on it, it's could be a pretty good PC for 499$