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Well, for one you can avoid messing with NAT traversal and port forwarding if you just use onion services.

They list some more reasons here, mostly just for privacy/anonymity: https://github.com/TryQuiet/quiet/wiki/Quiet-FAQ#why-does-qu...

So run Tor if you need those, I'm still not getting why it needs to be a dependency persobnally.

It simplifies p2p network design and removes the need for us to run STUN/TURN servers.