HHSN requires you to run an aspect with one less fragment, chose a sub par grenade, uses a grenade charge instead of a melee, and does damage to yourself that you can off yourself with.
All the while not being able to 1hk your opponent like Thunderclap.
Either HHSN needs to be able to 1hk or TC should not.
I'm not saying HHSN is in the best spot, but it's a little disingenuous to not bring up the downsides with Thunderclap as well. Being able to both move while casting and cancel HHSN make it substantially less risky to use