Thinking about it. If apple had dropped their vision pro with something like you can play Half Life Alyx on it like they did with Death Stranding with the M2chip/M3? they might have had a larger buyer pool.
There is zero chance Valve would release HL:Alyx without full steam support on the device.
That being said, I get what you're saying - that a killer game could have helped the value proposition. They clearly didn't design it for that though, even based on how much lower their refresh rate is for hand tracking.
It feels like a consumption device like the iPad, with some productivity mixed in.