DeFacto
"Only if the ailerons and spoilers are kept in the same position AFTER lift off AND through out the first 10-11 degrees"
Not the case at least on the large Boeings. Leave a large roll/spoiler input in and the aircraft may not leave the ground at VR and thus tail clearance can be compromised. Hence the option to increase VR (performance allowing). Remember tail clearance is a very real consideration in just normal conditions with these machines