If you talk to friends A, B, and C about the same thing, and the conversation reaches a certain point:

Sharing A and B's ideas with C and asking C to evaluate their viewpoints (cycling through a few rounds)
Sooner or later, you'll find: you've lost all three friends at once!
But if you talk to three different AI models of A, B, and C, you'll get a more complete and deeper understanding of the matter, and the answer you want most.