The system may not ask the tech to do it, but you do it to ensure the suspension is completely settled on the slip plates of the rack, especially so on old, tired racks with slip plates that aren't very slippy anymore.
And as for modern cars having only front toe adjustments, well, I guess I'd counter with the fact that very few cars these days still run a beam rear axle, meaning the ones using IRS at LEAST also have a rear toe setting, too. Even some rear beam axles can be shifted in their mounts to equalize rear toe (but not adjust rear toe numbers individually.) Equally wrong is still better than inequally wrong when it comes to the rear alignment of most any vehicle.