Joss gave Spike the heroic death, had Buffy choose him in an episode called The Chosen (which, yeah, had other meanings, but certainly this one as well), had Buffy's last word be Spike, gave the couple the flaming hands of passion, and finished off the destruction of Sunnydale with Spike's trademark knocking over the Welcome to Sunnydale sign. If that's what you mean by Joss not caring about Spike or Spike/Buffy, then I wonder what he'd have had to do to convince you that he did care.