What Is the Benefit of a Single Aggregate Signature over Multiple Individual Signatures On-Chain?

A single aggregate signature (from a threshold signature scheme) significantly reduces the on-chain gas cost and the data size required to verify the oracle's report. Instead of verifying $N$ individual signatures, the smart contract only needs to verify one compact signature, which cryptographically proves that $T$ out of $N$ nodes agreed on the data, making the oracle report more efficient and cheaper to consume.