Mackay is breaking the game
Seriously not much else to say. His ability in its current state breaks the game and creates infinite possibilities of corners you need to check with almost no downside to him. The cooldown isn't long, he grapples quick, recovers quick, and the height gain is massive. Things that take other specialist 30 seconds to run up stairs, he can climb in an instant. There is nothing fun about playing on Manifest when the entire enemy team is just grappling to the top of containers and cranes where most players cant reach.
It honestly needs to either be removed as an ability or severely toned down. The whole game has turned in Mackay's on top of shipping containers with the SFAR while being almost untouchable. Honestly a more fitting ability would be something like the grapple from Hardline where team mates can use it and so can enemies. Have it only be vertical and he has to setup for it.