Fwiw, I am in precisely the same position as Mr A.
I have never ever used a vacuum system for removal and, despite the fact that I can quite easily see that it is a far cleaner and easier operation, if I am taking the time to do a service on a vehicle of mine then I would prefer to do it properly rather than cleanly.
I actually take it beyond just draining from the sump. I always drain engines when they are up to temp, ideally after I return from a trip where the oil will have been sloshing about inside. I have a large metal collection vessel that I place underneath the hot engine (avoiding the exhaust manifold, previous burnt knuckles have taught me to be cautious). THEN switch off the engine, remove the filler cap and release the sump plug with a socket.
I then leave for a few hours, so that every drop is released.
When I have re-filled with the new oil, I keep the containers. After a couple of days resting in my garage I carefully decant the old oil out from the collection vessel using a clear pouring jug, into the those saved oil cans that I take them to our council dump in.
I hold each clear jug in front of an LED spotlight before pouring it, to view the contents. I also have an old kitchen spatula that I use to scrape the vessel out with, also to inspect the detritus that settled to the bottom.
I realise it all sounds "a bit" less straightforward than the way your professional Mercedes technician would choose, but I'm used to doing it "my way" and all set up to do so.