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I believe that the development system "without randomness" is a plus. It doesn't necessarily simplify hero development, but it prevents you from deviating from your intended path if randomness throws something unexpected your way :).
Previously, I always let neutral creatures go because I was too lazy to fight them. Then I discovered such a wonderful thing as "auto-battle." And experience comes, and time isn't wasted :). I only replay battles in which I suffered unacceptable losses. However, experience is gained even if you let them go, but only in a reduced amount, about fifty times less :(. I hope that auto-battle won't be removed in "Heroes 6."