https://techcrunch.com/2023/04/18/how-to-avoid-hardware-pitfalls/

You’ve likely heard that “hardware is hard”; mostly because hardware startups have to deal with things that software companies don’t really have to worry about. That includes pesky details such as “physics” and “battery management” and “general wear and tear.”

Hardware development is complex and challenging. Physical parts have tolerances, both in size and material properties, and components get hot and their characteristics change when they do. Once you’ve designed a product, the manufacturing process itself poses significant challenges. Ensuring that components are produced with the required precision and quality demands careful planning and rigorous testing throughout the process. Hardware manufacturers often work with multiple suppliers and manage supply chain logistics, which can be resource intensive and time-consuming.