Plus it's a dead giveaway to look out for it when his icon starts flashing.
There's also the thing that makes counters overall weaker than DPs: it's a counter, and not an attack, unlike other astrals.
With an attack, you can actively impose the move on the opponent via mixup and other tactics. But with a counter the opponent has to hit it for you. You have less control over it. If the opponent stands there and does nothing against an attack astral, they get hit. Against Hakumen's astral, you get bodied.