The packaging AMD uses for their desktop processors is cheaper, and much worse in terms of performance and power efficiency: moving data between chiplets is too

The packaging AMD uses for their desktop processors is cheaper, and much worse in terms of performance and power efficiency: moving data between chiplets is too expensive to work well for a laptop processor. (That hasn't stopped them from shipping the latest version in a BGA package for use in massive gaming laptops to compete against Intel's desktop-silicon-in-laptop-package parts, but the idle power draw still sucks.)