actually i do

It's because of the design of an f1 car (with an absolute must for a low center of gravity) they really don't have any other option than to lie the driver completely down.
But thats completely missing the point here. What you want is a comfortable and effective seating position. And that's what Renato has created here.
But as stated by GUNSTAT :
There are as many seating positions as types of racing and racing cars, I'm sure we can all agree on that.
->That's the truth and that's the only one!
I on the other hand-when driving on the nurburgring(in real life that is)-move my seat almost forward to the maximum to an almost upright position. If i don't, i feel like i'm not in control and because i'm not stable in my seat due to g-forces throwing me all over the place. In a simulator this of course is not the case and also not so relevant so i can see your point of wanting to lie down. In real life though... i dare you