I think that quote a few seller here aren’t aware of why Chargebacks happen and how they can dispute them. For starters, your buyer can’t initiate a chargeback if you’ve delivered everything that was decided the way it was decided. Even if your buyer initiates a chargeback you are well within your right to dispute it especially if the client Confirmed that everything was OK with the order. In such cases, just take images of the order and what you delivered and send them to Customer Support so that they can dispute the chargeback (you might need to be a bit forceful sometimes).
You can read more about it on Paypal’s site: