it seems to me that, today, this seems perhaps more a discussion of "historical context" than material reality. after all the evolution and adaptation that's g

it seems to me that, today, this seems perhaps more a discussion of "historical context" than material reality. after all the evolution and adaptation that's gone on over the last couple decades i wonder if saying "bsd is unix" is any more than a notional thing. is the linux kernel materially and substantially different from any current bsd kernels?