Though he’s primarily associated with sad-suited midcentury businessmen, Dale Carnegie, who frequently aired his boredom with traditional career hierarchies and hymned his devotion to the power of personality, seems more like a precursor to many a modern tech entrepreneur. Hard labor, Carnegie argued, is less a path to success than fresh ideas are. Old models are to be questioned, then modified or thrown out completely. As Steven Watts suggests in his new biography,<b><i> Self-Help Messiah: Dale Carnegie</i></b> …