Hello! The answers to your question are listed on the page.
LeftoverAtoms wrote:
This is such an amazing feature so why has Meta broke the feature and never fixed it?
Answer: Its implementation depended on deprecated Meta Mixed Reality Capture features that have since been superceded by LIV SDK.
LeftoverAtoms wrote:
Are there any alternatives for native casting from the Quest?
Answer: As one alternative, the LIV Creator Kit, part of LIV SDK, provides in-app spectator camera features. However it doesn't cast directly to the Meta Quest app, and no current alternative does so either.