If Aegon didn’t have the dragons, that would be a pretty good policy if your objective is to unify previously warring kingdoms and prevent interregional warfare.
However, I firmly believe that Aegon felt the dragons obviated all of that. Harrenhal was all the proof he needed that fortresses meant nothing, when he could rain fiery death from the sky at will and, more importantly, when everyone in Westeros knew what he could do.
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