Larryi,
I think we're in agreement. Different words, similar concepts.
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I guess that makes all Well Tempered arms trash. I don't think so.
The first function of a tonearm is to center the cartridge directly over the (constantly moving) record groove.
If a tonearm's bearings (or whatever it uses to function as bearings) impede horizontal movement of the cartridge in response to the groove's inward spiral, then to the extent of that impedance, the tonearm will impair sonic performance by placing unnecessary lateral compression forces on the cantilever and suspension. In general, the sonic result would be slowed or softened dynamics and diminished amplitudes.
This is true regardless of the brand name of the tonearm.