When driving tracked (T100/Slammer) vehicles, giving a steering input cuts forward power. This adds to the unresponsive feeling of tracked vehicles in Arma3. If you are driving down a road, every time you give a steering input, your speed drops suddenly more than it should and it also causes some vehicles to have erratic steering. It also makes the vehicles seem sluggish. Tracked vehicles are also difficult to manuver at low speeds.
When you give a steering input while moving, forward acceleration should still be maintained, as it was in Arma2.