Since it's a neck thru, I don't think you should be afraid of sustain loss. But because it's a neck thru, the main resonances come from the neck wood, because that's the 'core' that is mainly under tension. Will the outer wings matter tonally? IMHO yes, the will, but with much less effect to the tone, especially with those glue joints, but good glueing can veritably 'fuse' wood fibers together.