The linux kernel is successful partly because by and large what's in the kernel works and doesn't generally break on new revisions. Accepting a new driver whic

The linux kernel is successful partly because by and large what's in the kernel works and doesn't generally break on new revisions. Accepting a new driver which may in fact not work, breaks in ambiguous ways, interacts with other components poorly, or otherwise generates headaches for the kernel could be more trouble than it's worth. Ultimately this driver will eventually need to be modified by others, and ensuing it doesn't get a reputation as a nightmare right out of the gate is also worthwhile.