The only legitimate benefit I can think of is to 'unstuck' a transaction.
If I initiate a transaction using a very low fee without setting the RBF option, my transaction is likely going to get stuck, (how long would depend on how clogged up the network is);
• Once a transaction is signed and broadcasted, it is validated by nodes and appears in the mempool, where it would then be picked up by miners and included in blocks for confirmations. A transaction can stay in the mempool for approximately 2 weeks before it is dropped if no miner takes it up.
• To avoid waiting this long the sender can initiate a double spend or use CPFP ~ Child Pays For Parent, to unstuck the transaction. So they send the exact same UTXO to another address and they can then perform the initial transaction with a higher fee.