Answer your question why they don’t bring the weapons it’s because it's to juxtapose the two factions. It was a design rule that Autobots couldn't transform into weapons of war or use weapons. Prime's Axe was actually a tool. It was to show that the Autobots won the war, and are now transitioning into a more peaceful state. The 'cons still want to fight, and are inherently war-like, so they become military vehicles. It’s also a way to show the Decepticons as an overwhelming force.
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Answer your question why they don’t bring the weapons it’s because it's to juxtapose the two factions. It was a design rule that Autobots couldn't transform into weapons of war or use weapons. Prime's Axe was actually a tool. It was to show that the Autobots won the war, and are now transitioning into a more peaceful state. The 'cons still want to fight, and are inherently war-like, so they become military vehicles. It’s also a way to show the Decepticons as an overwhelming force.
Great reaction.