Recently, a guitar shop owner told me that I shouldn't string flatwounds through the body of a bass, because the bend in the strings at the bridge weakens the integrity of the string. This could cause the string to break or degrade the sound in some way. He said that I should only string flatwounds on string-through-bridge setups. Any validity to this claim? I recently switched to flatwounds on a string-through-body J bass and now I'm curious.