Uhh, yeah. I have yet to see anyone, let alone a WC racer, ski with his/her feet behind the feet.
On a more serious note, yes, because 90% of the time they try to get forward for that 10% that matters... In reality, the forces and dynamics of the turn are more complicated and we need to get "forward" not just along the ski, but even if we just look at the plane related to the ski, I don't how much more forward of the toes they can go, but definitely in front of the heels, i.e. not just "on top of the feet" but more forward than that.
All you really have to do is to get in your boots and in your bindings and extend the legs, supported by the cuffs. Then look in the mirror and drop a plumb to measure how much forward of the boots the hips really are / can be.
Since you brought up WC skiers, they rarely push their hips forward, rather just pulling back the boots under/behind the hips and keep them there as much as possible, which is whenever the feet are long. When the feet get short, they pull them back to be aligned and to get back forward as the feet get long on the other side.