I think the ideal use case is more so that if you have a conditional path and a timeout path, if you encumber the conditional path with an OP_EXPIRE, then you can defer collecting via the timeout occurs.
eg, if you have a closed lightning channel with 50 HTLCs with varying timeouts over the next 7 days, currently you should probably be claiming each of them as soon as they timeout. But if the “reveal preimage” path were encumbered by an OP_EXPIRE, you could wait until they had all timed out, and claim them all in a single tx, paying to a single new output, and avoiding ending up with various dust-y utxos in your wallet.