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haven't balanced a tire before but have the same issue on other bikes... but see no need to balance in the future. interesting deduction.
not sure what point you are trying to illustrate with bearings... less friction on the head would make small oscillations turn into bigger oscillations easier in an unbalanced system. bearing drag, or the lack of bearing drag would not change the fact that your wheel is out of balance causing the imbalance in the first place.
i'm sure you've got way more experience than me. (i'm guessing from your post about 2 decades worth) but don't be quick to dismiss young whipper snappers. i love when i go talk to old school harley cruisers that tell you counter steering is bullshit and how they only use the rear brake because if they use the front you'll go flying over the handlebars. but you say you have never balanced a tire and are talking about stem bearing drag causing wheel oscillation. scary dude.
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