Human typeset books most definitely do not manually choose the location of every hyphen. The font, the font size, the word spacing all get priority, and the type setter isn't going to go back and mess around with those once again just because the finely tuned settings he chose carefully resulted in a few hyphens in less than ideal locations. You can't retrospectively fix the hyphenation without affecting all those other parameters already chosen.
It's a tussle between mainly word spacing and hyphenation, and no typesetter worth his salt would mess up his word spacing to "fix" hyphenation. Poor word spacing can mess up your enjoyment of an entire line of text. Poor hyphenation only messes up one word.
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