By the time you’ve inched toward the halfway point of the first episode of Shōgun, the epic new limited series that revisits James Clavell’s 1975 doorstopper of a historical novel about early 1600s Japan, you’ve already seen an eyeful: massive schooners, flashing swords, military processions, political power plays, a father and his infant son sentenced to death, a half-dozen English prisoners awaiting their fate in a pit.