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Correct. BIP-39 is a convenience protocol. And it's been "discouraged for implementation" (because this) which is why it's not in Bitcoin Core.
However, one cannot get rid of BIP-39 even if it's as horrible as cryptographers think it is because after the PBKDF2_SHA512(mnemonic_seed) you cannot reverse it... so it's here to stay no matter what, in lieu of a better standard.