Yin Zheng seems to have been interested in his own bodily survival; we're told mercury, the metal, was suggested to him, which may have been less elixir, more cause of death and perhaps madness.
Much of the handbook's vocabulary is European: BC and AD, 'feudal system', aristocrats, Emperor, Duke, and so on.
Communist Party dogma probably insists that the past was horrific; in this case they may have had a motive for promoting a short-lived so-called unification.
Incidentally, much of the source material is in the work of Sima Qian Shiji, Records of the Grand Historian.
'Wars' at one stage seem to have been decided by a chariot match or two.
So it's difficult to assess just how warring the 'Warring States' were.