I understand why they have the requirement: They want a 3d model of your face that they know is good enough so that they can make the facial interface.
What I don’t understand is why do they not accept a 3d model you create yourself? Using photogrammetry and a friend, it would not be too difficult to get a good 3d model of your face. Heck, they could even do a service where you send the photos of your face directly to Bigscreen where they process it for an extra fee. Boom, now there is no iPhone requirement to buy the product.
They use the front face scanner that’s used for Face ID, right? I’m pretty sure those have been on all iPhones since the 10 from 2017, so it’s hardly a bleeding edge feature considering it’s 8 years old. Having an iPhone as a hard requirement definitely sucks though.