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Terrible argument based on not understanding how fighting works. Anyone who has ever done as much as play paintball knows why this doesn't work: because troops in combat will not present themselves fully to the opponent, minimising the options for successful firing. If we go back to paintball (which I have played about half a dozen times with different groups of people), an 8v8 fight should end in about 15 seconds easily, however, from my experience most games took about 5-10 minutes. Amounting to a factor of 20-40. Take into account that paintball fields are generally arranged for dynamic play, and that mistakes don't cost a life.
Fortifications can also easily and quickly be mocked up, as everyone who has watched livestreams of protests in Kiev (holy fuck it's been three and a half years already?) knows.