I'm not sure you're clear on the difference between a SoC, and a System on a Motherboard. In the case of the motherboard, you are absolutely correct. However SoC means System on a Chip. For any manufacturer, if you put all the components into one IC, I'm not seeing how you can reasonably "repair" a component that's on that die? It's necessary to replace SoCs. But yeah, if you have an SSD on a motherboard, you should be able to replace it.