However, I think you should think of this in a different light: Purism's real problem is: How do we bootstrap this device?
That is to say, there is simply not enough money / engineering talent to both develop all the hardware AND all the software needed to bootstrap this thing. It must appear "viable" to the public as a 1.0 product.
Therefore, using convergence to bootstrap the product and then building out native UI's in further versions is probably the best decision.