I know a few people who run IoT startups. When creating a new version of your piece of hardware involves shipping the designs off to China, getting the hardware

I know a few people who run IoT startups. When creating a new version of your piece of hardware involves shipping the designs off to China, getting the hardware back, checking that it's correct (repeat until actually correct), and then pulling "Yes, mass produce" ... before you even have anything consumer facing. Basically, each "iterate" takes a few months and many thousands of dollars. Lean kind of stops being all that lean. Lean is easy in software. Thinking before doing is important in hardware.