Well, that's true - you would not necessarily have to replace the bearings and grease seal. At his 220k mileage accumulation, the idea for doing that might be to go ahead and take care of it during a convenient maintenance event. That is, do it all at once.

Even if you take the approach of maximum usage of components, I'd go ahead and replace the grease seal because they do wear with usage and lose the ability to seal.

Something of a judgement call.....

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles