It's important to have good skeptics critiquing your product visions. Particularly if they are knowledgable and well intentioned.

With a big vision like this, it'd be concerning if everyone was just cheerleading them on and being yes-men.

The realistic prospect for a product success is rarely heavily scrutinized. And success rates are always statistically quite low.

Mr Charles raises some valid doubts about launch time. They're most certainly not a stretch - considering the tons of horror stories about launching hardware products we've seen on HN.

Let alone attempting to create a whole new market segment in a highly competitive environment - where even with success - making money might be difficult.