"It seems like someone could replicate that in the US with a warehouse and sourcing. These things are extremely cheap in general;" There are an infinite number

"It seems like someone could replicate that in the US with a warehouse and sourcing. These things are extremely cheap in general;" There are an infinite number of module combinations. They all vary in cost, quality, precision, speed, size, materials, performance, suitability for manufacture, and subtly in whatever it is they do. A commenter above mentioned the vast number of professionals with a ton of know-how in this area, making the 'time to tweak' or 'from nothing to module' and also 'optimized for manufacture' very rapid. There's nothing remotely like it anywhere.