[garmaine]

Why is it needless? SHA3 was designed to complement, not replace SHA2. Blake2* are preferred by some but they are not the national standard and have their own quirks.

[tuxxy]

HMAC is useful because it fixes some flaws with the Merkle-Damgard construction that SHA2 uses.

SHA3 and Blake2* use different constructions that don't have these flaws, thus they don't require HMACs for their needs.

[garmaine]

Ok, your original comment wasn’t clear on intent.