I read they recommend to use the both (adaptive hashing and "local parameterization"). As even if you utilize separate device (HSM for example) for encrypting the passwords (I'd encrypt instead HMAC), you should indeed not give up on adaptive hashing.
Here's some good commentary on this by Solar Designer (user solardiz on Reddit): http://www.reddit.com/r/netsec/comments/26d52c/yescrypt_pass...