I don't really think that the Inkstrike needs a buff. While rare, seeing a team full of weapons with Inkstrikes in Turf Wars pretty much spells doom for the other team more often than not (during the Splatfest I got to see a match end followed by 4 enemy Inkstrikes on our base; we literally lost the whole base and we couldn't do anything about it). One thing I never understood is the reason why so many think the Inkstrike is useless; if it's not good at Splatting enemies maybe it wasn't meant to be. It's the only Special that reliably covers a decent amount of Turf anywhere on the map; I've splatted more enemies with bomb rush active than Inkstrikes, and even then they usually get to launch the missile anyways
I somewhat explained why in the post above yours, no not why it's useless, no one ever said that I don't think, just why it's underwhelming and outclassed. That's assuming it's being used correctly of course. Using it just to spread ink is borderline useless as your main weapon can spread the same amount of ink in the same or less amount of time. Even bomb rushes I wouldn't use purely to gain map control with, much better off saving them for their zoning capabilitys even in Turf War.
Now yeah the Inkstrike does have infinite range, and I see by your underlined part that you're making it out to be an advantage over the bomb rush for turf coverage, but it actually isn't. The range is more for it's zoning than it's ink spread, because outside of the last couple seconds in Turf War, there's no point laying ink down way out of your reach. You can't possibly hope to defend n hold that ink you put right next to their spawn, and it boggles my mind that I still see people in Turf War doing it constantly. All it does is give the enemy free special charge.
Additionally, due to the long delay which forces you hide away so you don't die, it's hard to take advantage of the turf spread before the enemy just inks over it, whereas with Bomb Rush you can be right there adding on to the pressure. So okay, the Inkstrike still outranges Bomb Rush, but then, the Killer Wail exist. If ya want zoning + ink coverage, theres Bomb Rush, pure long range zoning, go Killer Wail. The Inkstrike was probably supposed to be a mesh of the two where it's effect is weaker than both at what they do, but still can do both their jobs making it more versatile, but as said in the beginning of this paragraph, it kinda fails at fulfilling Bomb Rushes roles. The buffs I suggested would fix all that though.
I've killed way more inklings using Inkstrike than Bomb Rush, especially this past Splatfest, but regardless the fact is Bomb Rush does not hinder your survivability whereas Inkstrike does, and launching the missle definitely doesn't make up for dying.