Harbor's in a tough spot because if you buff him he'll just become a staple in double wall meta which everyone collectively thought was boring and annoying. But none of his abilities function that well as solo smokes. I thought Abyss would be an okay solo smokes map for him but I ended up just playing Astra again (biased because Astra's been my main since 2022).
I fully see (maybe even expect) a potential rework to remove his waterfall ability and replace it with some different thing. Maybe something like a stim beacon/damage amp. A flash wouldn't make sense and neither would a molly, and the stim beacon effect is only seen in two characters (brim and reyna empress giving the faster firing and reload). We also already have enough "space-creating" offensive walls (pheonix, neon, iso)
Harbor just needs something that makes him even appetizing to play as solo smokes and when all of your abilities are smoke abilities you feel kinda useless. That's why I think the waterfall is the most expendable. The orb is a good concept and the wall is fine even if it's just so Viper isn't the only one.