I think part of the reason that you never heard of this with other brands is because the MB dealers began using a very nice oil suction system in the dealerships. This was done for shop efficiency, not because it does a better job.
Taking this to the next step, there are those that think that if the dealer does it this way, it must do a better job.
Thus, the topsider entered the picture.
I, as you, never, ever heard of using such a device at home before finding mercedesshop and sharing much dialog with all these great MB owners.
Have a great day,