Yeah - so layer-lawyer would argue that the only thing that needs to talk to serial.h would be the protocol - but, in the real world of deployments that actuall

Yeah - so layer-lawyer would argue that the only thing that needs to talk to serial.h would be the protocol - but, in the real world of deployments that actually work in the field, it's often the case that layer lawyers get in the the way, and being able to bypass the protocol to talk directly to the phy is a thing - which means you end up including the phy at multiple places. Purity vs Practicality.