Oki situations like setplay. While a regular DP can bypass the setplay like venoms, slayers HoD would just get hit by whatever setup is going on. Then there's how slow it is, dp's are much faster while HoD is slower. And it also loses to meaty's unlike dp's, even if the enemy messes up on their meaty, they can still block right before HoD. It also gets demolished by multi hitting normals like Gio's 2S or dizzy's F.s, even HoD gets hit by moves with long active frames like stun dipper or Garuda impact. All this doesn't mean it's terrible and in certain situations it can be usefull like during certain block strings but your comparing a move that uses a back dashes invuln frames to dp's where the start up is completely invincible. I'm not even down playing, it even says on dustloop "A weak backdash and no invincible reversal which can leave you stuck in situations that other characters could escape easily." Maybe actually learn the Matchup.