It does not make sense to bundle PC and laptop in the category of a
device that will ask for IA_PD option from DHCPv6 server. Further this
draft clearly says it's describing a home CPE Router in Internet enabled
homes. Most common home Internet connection is cable or DSL. So where
does the question come from for a cellular router in one's home? Are you
talking about wireless Internet services for the home? Even if that is
the case, so what? As far as there is a link from that wireless service
device to the CPE Router, this draft covers even that deployment.
I don't think the CPE Router discussion is ambiguous. We are just not
discussing a mobile phone in this CPE Router discussion!