It depends, it can be harder on the driveline if you're shock loading it thru spinning tires and suddenly gaining traction.. thou that's not super common. Think of doing a gravel burn out and grabbing pavement, then replacing your ring and pinon. Constant load is much easier on equipment than variable load... look at the power ratings of the QSB marine motors, but they operate at constant load.
Torque is managed, regardless of the load, because the drivetrain isn't strong enough to handle 900 ft/lbs multiplied thru first gear, or even 2nd and 3rd gear. U-joints are too small, so is the rear axle.. but it's hard to get enough traction to get that power to the ground. So whether you have a load or not the programming keeps the power within the limits of the components.
I can tell you this, when I decide to tune my truck.. which I'll do myself, I won't be adding any power or throttle responce. I'll be making other changes.
On my 05 I actually decreased the throttle response to help the drivetrain with the added power.