[icegreentea]

But different cases. The picture you linked (and many other cases) have low recoil because the missiles are equipped with a small jump motor to get the missile away from the launcher before the main motor launches. This is to reduce recoil, and the blast (you can fire from confined spaces safely).

The "lack" of recoil in the rockets in the pictures (as well as most rockets used as artillery) is because there is very little of the launcher impeding the rocket exhaust. Nothing in the way for the force to transfer onto the chassis.