Diversity mod only makes changes the AI can actually take advantage of. No more orbital units that let you instantly dominate the field with no resistance, or shield of the way which makes you invincible to even 7 supreme AIs against you (it does, I tested it).
These images show AIs in various game states. You will notice the massive increase in shield generator construction; a typical hard AI in vanilla supcom would not have built a single one yet.
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