Which is actually better as it means you can excise the faulty ones easily and/or fuse the broken subunits. The main reason to integrate things is performance

Which is actually better as it means you can excise the faulty ones easily and/or fuse the broken subunits. The main reason to integrate things is performance and it runs counter to yields. If you can have a specialized process to produce whole wafers of HBM or GPU cores with decent yields then another good one to plug them together you have a winning combination. Not understanding this is why the microprocessors from many subunits tended to fail badly. Either the design was not performant or it ran into yield issues or it has to use the exact same technology to integrate modules which was not invented or perfected at the time. So you would need a process that does everything well which is much harder than having a specialized process plus integration.