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The reason for things being SOP, such as disconnecting the battery negative before doing electrical work, is as much to get in the habit as anything else. If you start doing electrical work such as replacing a marker light (is this the light fixture or just the bulb?) without disconnecting negative, you may forget to disconnect it some time when it is important, such as working around the starter.
If you're simply replacing the bulb, no, I wouldn't advise disconnecting battery negative. Replacing the socket, yes, you should. Mercedes sometimes wires these vehicles "funny," meaning an accessory with a hot lead and a switched neutral. Other items such as the "light horn" (headlight flasher) are live at all times. Some vehicles have undocumented rewiring compliments of a PO. All that can lead to surprises if you think everything is dead just because the key is in your pocket. If you're lucky, it will result only in a blown fuse, but people have smoked their car in such cases.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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