Specifies the nLockTime anti-fee-sniping behavior that Bitcoin Core and Electrum already implement. BIP326 assumes these rules as the baseline and uses nSequence instead for some taproot spends. The nLockTime path itself was never specified.
Discussed on bitcoindev https://gnusha.org/pi/bitcoindev/wWGWjMw9TI22vp4VzCm4xJJS3IGA1UhndMKynUkB04BqeoRjhe-QbDbJU-GMQq0nnOnXuB__u8KcdIcxU5i8Cy9pbTbtJ7Hi583FzLVojek=@pm.me/