A low final fee doesn't always mean a transaction can start with an equally small gas budget.

Sui's documentation explains that deleting stored objects can return part of their earlier storage charge. That rebate reduces the net cost, but the transaction's gas budget still has to cover execution requirements before the rebate is settled.

For $SUI users, the practical distinction is upfront capacity versus final expense. A displayed rebate shouldn't be treated as spendable gas for that same transaction.