While it is understandable from their perspective that the bike companies act this way, such shenanigans do devalue the frame warranty. Rather than just accept the idea of warranty at face value, it would seem to behoove the buyer to study it carefully and look for advantages in one brand's coverage over another. It could matter in the final purchase choice, especially if all other aspects and the choices being considered were about equal.
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Robert
No matter where I go, here I am...