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First of all: these units can only be healed from Nymphs (and Nymphs can only heal them) once per battle. Secondly: Archers don't ignore defense entirely, but by 50%. Thirdly: Light Elf Dragons aren't that strong or tough when compared to Dark Elf Dragons. Fourthly: what if an Orc buffs Anti-Chaos to protect their troops? Dark Elves, at least, have Arcane Wave, so weakening Chaos will affect them less than Light Elves. And fifthly: you can say all of this about any faction because everyone has their strengths and weaknesses, and all of this together is called balance. The idea of all my recent posts isn't to show how weak Wood Elves are against Orcs, but that not only Wood Elves have something to counter Orcs.