There's indeed a lack of diversity, slaying dragons becomes a way to pass time between exploring instead of discovering new terrors lurking in the wild. As for the AI changes, most of it I approve with altho I doubt it would be possible, besides the Fear effect which should be rather simple considering there is already a magical effect to make creatures flee. But the thing that bugs me the most about the dragons isn't their AI or that they all are genetical twins, but rather the flight patterns they tend to use. Dragons should be indeed agile as they are in game, but the animations seem a bit off, a dragon suddenly taking a 75 degree turn in 0.00002 seconds seem kind of sluggish. Bigger areas of patrol and agro range on dragons, making them able to patrol around with in a larger area and presents more ways of approaching the player, being it swooping down from above for a single precisive fireball strike upon the player, a long and carefully coordinated strafe ravaging the landscape with frost and fire or a simple head on approach from afar, scorching the land with every step it takes and mauling everything out of its way with talons and teeth to you would be more enjoyable. Long story short, more diverse/realistic flight patterns/attack formations, which provides dynamic and unpredictable combat.