First map every function to a discrete module, then treat each module like a spare part in a motorcycle kit—easy to swap, built to last, and not dependent on the latest chip that will be obsolete next month. Use proven connectors, a single robust power bus, and standard industrial-grade materials for the chassis. Run a cycle test on each module separately: drop it, heat it, battery drain it, then reassemble. That gives you a “durability budget” before you add any flashy interface. And when you hit the trend line—say a new graphene sensor—pause and ask: will it survive the same stress tests? If the answer is no, stick with the tried‑and‑true until the market forces you to upgrade. In short, let the modules do the heavy lifting and keep the outer shell simple and reliable; trends come and go, but a solid design stays in production.