Hardware (and firmware to a lesser degree) almost require waterfall. Moving fast and breaking things doesn't really work well when you have to throw away the ph

Hardware (and firmware to a lesser degree) almost require waterfall. Moving fast and breaking things doesn't really work well when you have to throw away the physical product you broke as opposed to iterating it to a fixed state. I can actually see the merit in waterfall for elements of the backend.. though how do you avoid pre-optimisation or even complete wastage building out APIs that end up never being needed?