That one change simultaneously made the Fire Nation hilariously underpowered and everyone else hilariously stupid for not realizing how underpowered they were. Earth, Water, and Air benders should all easily have been able to put the fires out with their elements but no one in the movie world thought to do that.
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I don’t think it is, actually. One thing on the very short list of things he got right is that the Fire Nation’s advanced technology was huge. Consider the difference in ships – the Northern Water Tribe is still using sails and oars on a wooden hull where the Fire Nation is using metal hulled vessels with coal fired engines. Fire Nation ships are a good century or two ahead of the competition. On top of that, they’re using rudimentary tanks where the next best thing is a Flintstones-style foot powered APC used by the Earth Kingdom. The reason Sozin thought the Fire Nation was so much better than everyone else was probably because they were on the verge of an industrial revolution when everyone else was medieval or the equivalent of the early Renaisance.