I love these discussions.
People using science to argue their point when in the real world very few people, even musicians, can tell any difference. Pretty sure Joe Average can't.
Anybody who has attended a Bass Bash and participated in any of the various tests will know that most people can't even identify their own basses, never mind fretboard material, active/ passive, cheap or expensive.
If the OP is looking for a lightweight timber, can I suggest that you keep your advice to that topic.