In my experience it has more to do with the fact that all those components wear differently and/or some are balanced as assemblies. Meaning that by not marking it you may have installed a tripod onto a surface that was wearing differently than the orientation it was in originally; this could result in excessive slop, noise, premature wear, nothing at all, ect.
Its more for quality and/or keeping things together in the grooves/wear that it was in before than anything too significant as it doesn't need to be "timed."