How would the wheel bearings become scored or bad? From lack of grease? If so, then you probably don't need to worry about that. I recently opened up a w201 in a junkyard that looks like it had been sitting for a year + in there with 290k and I pulled the wheel/bearing/hub out and that thing was super packed with the green OE grease....a ton of it! I took it apart because I thought about doing mine, but after seeing how the one in the yard looked, I figured I was ok on that front. No dust or any dirt in there either and this is the desert with huge sand storms.

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1990 190E 3.0L