If I remember well Boeing changed their filosophy into "auto Pilot Off, Auto throttle off " about ten years ago. There was an AD for this. Apparently there were some incidences where during flare, the AT just inched a bit forward, and the story ended in a long landing.
It now results in funny go-arounds, as the Throttle has to be manually set by one of the pilots.
"TOGA, flap 15" gives you a nice FD, but that is all.