Bracing is both tone-shaping and structural.
The structural aspect is needed to prevent the bridge from rotating due to the pull of the strings.
In the case of Breedlove, they decided to go light on the X-brace and then they employ that JLD truss to help prevent the bridge from rotating.
If you loosened or removed it, you'd probably get an increased bass response at the cost of structurally weakening the top.
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