Missles are just not consistent enough to be considered a huge threat. They're helpful for sure, as they guarantee the enemies moving around (Whether that be just past the missles, or dead at the spawn point) (Unless they're under a grate). Which makes them useful for pausing a push for a couple seconds.
But tentamissles have always struggled whenever the enemies are far away, especially when locked onto >3 players. As they become easily the weakest special in the game when spread out. They're not painting, killing, or assisting your teammates much if they're easy for the enemies to avoid. Even if you have perfect timing, you're not aiming them at anyone. The game's rng decides where they land, and the slow activation time is so bad for tentamissles. Literally every other special starts going to work in a second or two, tentamissles just take too long to come down and start getting work done.
It's just the point where you go "Why not use stingray or inkstorm as a disruptive special?" At least you know where these specials are going, and you can control the outcome of them. And as a matter of fact, they're much more consistent than tentamissles.
"Oh
@ThatOneGuy stop being so r00d to tentamissles, I liek them"
To be fair, tentamissles are excellent as a check to stingray / other anchor type weapons. As they're not mobile, and can be reached without putting yourself at risk. But they're definitely not making the big plays inkjet, stingray, and bubble blower are capable of making. And they're too inconsistent at making smaller plays as well (neutralizing zone, inking a path, assisting teammates) to be considered really good. But this buff has made them (in my opinion) a lot more consistent when it comes to killing, so maybe we'll see more missiles in the future. But they're definitely not shaking up the meta right now.