They fixed the drive in later models, but obviously for the new version they broke out the old supply of cheap/faulty drives again.
It's like you don't even READ the stuff you talk about. The problem with the early models had
absolutely nothing to do with changing the orientation of the Xbox while in operation. Some of Samsungs in the Xenon Xbox's sold from 2005-2007 would scratch discs while the Xbox was reading them
without changing the orientation. They just did it while spinning the discs in normal operation. So Microsoft rolled out a disc replacement program for effected units.
It has never been okay to change the orientation of the Xbox 360 while it's in operation.The two issues are entirely unrelated.
It's just not okay to turn a non-mobile drive 90 degrees while it's spinning a disc at 7000RPM and a laser head hovers just 2mm away from it. By simple nature of it's rotation, it's working like a gyroscope and it resists movement that is at an angle to its plane of rotation.
Hell, the article on the Dutch tests,
which you yourself cited and linked to don't mention word one about changing the orientation. Some of the drives were just flat out eating discs when operating horizontally. They didn't rotate the machines while operating them or talk about that. Did you even read/watch it?
No one has said the Xbox 360 S eats discs when operating it horizontally unless you are dumb enough to turn it while it's turned on.
It's as if you not only failed high school science class, but you also failed reading comprehension in English class too.