It's a tough balance to strike, especially with hardware. I'd love to be able to put together a preorder page to validate demand for my next McGuffin, but it's very difficult to know specs, cost, and appearance before at least a representative prototype has been tested and quotes obtained from suppliers. And it takes a great deal of time and engineering effort to get to that point.

Of course I could show off something completely different than what gets delivered, but for some product categories, the entire appeal evaporates if the promised specs are not accurate. For example, something like camping equipment goes from awesome to pointless if the final product lacks key promised traits like foldability, waterproofing, low weight, etc. See also Magic Leap's marketing demo, which they ultimately couldn't deliver on within the constraints of a real product.

I think the Lean Startup methodology has a lot going for it, but it's very hard to square with certain products.

PS: Your video is really nice. I'd probably rather use a website that looks like that than one with fancy graphics and animations and formatting. It feels more like a professional tool than a flashy toy.