Onur Cobanli explains:
There is a saying: make it simple stupid, here a comma can change its meaning; make it simple, stupid or make it truly simple for stupid people to understand. Unfortunately I sincerely think that the original author meant the latter, which is slightly disrespectful. Regardless, you need to make your thing (product, service, artifact) smart for sure, but the smartness shall be understood and grasped through the ease of use and fault tolerance of the product, a smart product is rarely simple; it is simple to understand and use for the end user only .