The main problem was that they ran out of runway while waiting for manufacturers and suppliers to line up and meet their demand. The software was solid, but for

The main problem was that they ran out of runway while waiting for manufacturers and suppliers to line up and meet their demand. The software was solid, but for hardware products, that's less than half the picture. You need to worry about coordinating with suppliers, factories, and all these other logistical issues to produce a product a scale. If a supplier is unwilling to meet your demand, you're basically screwed and are left waiting indefinitely, unless you immediately pivot on your hardware design.