Not if you want to do it better than the competition. We already have a zillion radio chips that all do about the same thing. If Apple (or any other company) wa

Not if you want to do it better than the competition. We already have a zillion radio chips that all do about the same thing. If Apple (or any other company) wanted to be 'better', building a better design to do the thing in a better way (think efficiency, power, speed etc.) would give a unique advantage that cannot easily be copied by a competitor. Same goes for the RTOS (or lack thereof) that you need to run those. For some implementations, a softMAC vs. fullMAC makes sense.