My long time friend who is my dealer MB Tech said that there was actually discussion about not providing a drain plug on the latest models, but they predicted that there would be too much complaint from those who still do their own changes.
As long as you are changing frequent enough, the suction method will work out okay. Modern oils do a much better job of cleaning, making this more feasible.
The drain plug in my C Class seems to be in a good position to drain well. The biggest benefit of a drain plug drain for the home shop change is that you can drain the oil hot and let it drip for a long time. Some of the Topsiders and such, are plastic and will melt with hot oil. If the oil isn't hot, you are not removing as many contaminants with the oil. No good!
Have a great day,
Change oil hot and change oil often