If Apple had been first to market with a "wireless tether" VR headset that could have been interesting. A straight Quest competitor seems like an uninspired choice, especially as Apple has never been great at gaming, and the market seems less than Apple-sized.

AR glasses on the other hand they could bust wide open, but it all depends on the display technology. Literally nothing else matters unless the display is a huge breakthrough. I doubt that it will be good enough by 2023, unless Apple goes for a niche market first and expands wide a few generations later. But that doesn't really seem their style.