Inbred degrades DNA biologically.

Inbred stems from less variety.

If you hang out with the same person, you degrade in personal quality.

If you learn at the same spot, same places, same people all the time, your learning degrades.

Same for the AI, they inbreed and they degrade.

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I purposefully hangout with people (not all the time still) outside of my circle for that exact reason.