But they should rebuild every 3 or 4 years, if they find a better technology, yes? That was one of his points that he lists at the bottom: "Rewrite mercilessly

But they should rebuild every 3 or 4 years, if they find a better technology, yes? That was one of his points that he lists at the bottom: "Rewrite mercilessly (Our core search system is now on its 5th generation.)"