Im certainly no expert but having done control arms twice on two seperate maxs and never having issues despite never following those instructions; i wouldnt worry about it. Id imagine they tell you to do that because the torque values would maybe be different based on the load on the bushings. I always put the high value of the recommended torque range, as i said never had problems.

I will say that you will want to make sure that all the bolts are lined up. Theres a specific order you want to put the bolts in otherwise you could very easily crossthread them, wish i remembered how it went but its been years. Once you get the tighetening pattern correct its cake. Just be extra careful with the bolts to make sure you arnt forcing them in.

If anything, torque the stuff down to the specified range. Let the car down off the jack and then check the values again to be sure once its on the ground. I know 100% when i did this my torque wrench it clicked at the same torque setting regardless of preload or no preload both times i did this job. Do it anyways just to be sure though for the peace of mind.

Hope this helps