Can't plant grenade in the back of a Scorpion

Is this an overall feature missing from Halo 4, that the ability to plant a grenade in the back on a tank no longer exists? Or is this just a glitch only for me?

They purposely removed it:

> When boarding the rear of a Scorpion, you can melee, but you can’t plant grenades. To plant a grenade on a Scorpion, try boarding at the front.

Well that’s just stupid, because if the Scorpion has a gunner, the driver is going to get at least a riot before being blown up…

Really they removed that?

> Well that’s just stupid, because if the Scorpion has a gunner, the driver is going to get at least a riot before being blown up…

That’s the point. The Scorpion is a beast and it will always be a beast. That is just how it is. You’re supposed to fear it.