and since we are talking about peer-to-peer networks it is better to destroy everything after the trade is finished.
Yes, I also support the idea of destroying data after the end of the trade to preserve privacy on the one hand and to prevent the blockchain from being filled with useless data after the end of the trade and the delivery of the goods on the other hand.
But what if the seller or buyer wants to return the transaction data due to a dispute? This will be impossible if the data is destroyed.