You keep confusing streaming for computing which requires bi-directional, low latency interaction. Think about playing a 3D game with no controller using AVP. You're not just watching the game stream but actually playing it while looking around and using your real hands to interact. Sony's latest headset uses a thick cable but has lower frame rate, noticeable lag, 1/3 the resolution of AVP and no mixed reality element at all. If externally tethered hardware was a viable option for pro hardware, we would see older PC chassis being upgraded every year using the latest CPU/GPU outside of the chassis to save money but aside from some specialized GPU arrays, we don't see it.