In what cases is FindAndDelete useful?

In the non-segwit case, FindAndDelete removes signature data from scriptCode.

In P2PKH, the signature is not included in the scriptPubKey, so I think the only thing that may actually have signature data removed by FindAndDelete is redeemScript for P2SH.

But is there actually a useful use case for including a valid signature within a redeemScript? What was the intention behind introducing the FindAndDelete process?

In the following Bitcoin Core's FindAndDelete test case, the public key is recovered from the signature and set to scriptSig.

https://github.com/bitcoin/bitcoin/blob/v28.0/src/test/data/tx_valid.json#L496



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