Compare to other controllers -
Astra has stun and pull/vulnerability which helps the team besides smoking.
Brimstone has stim beacon and Molotov.
Omen has flash and also mobility to play like a duelist and get out of sticky situations or fast rotate.
Viper has 2 decaying smokes and also a molotove that makes enemies vulnerable.
Meanwhile Harbor has only...smokes. His "Cove" ability is easily breakable in 2 secs. Its ok for defusing last few secs of spike but 99% of the time that ability feels too useless.
On the other hand his other almost useless ability is Cascade walls. You cant rotate the wall so you HAVE to face towards a spot to place it well. Only if the wall had a slight rotating mechanic then you could block areas from different angles.
His ult is fine. It can be used to know enemy positions and acts as a recon ability so i dont think it needs any change. But i wasnt talking about ultimates in this post. Just the general abilities.