I think playability is all about the neck. Later Wal necks also have a secret laminate of graphite under the fingerboard which contributes to stiffness, in addition to the wood laminates. If anything the wood in a bass neck dampens and filters while the fingerboard provides rigidity - Vigier necks are a great example of optimal rigidity (90/10 system plus phenolic fingerboard) while still allowing enough wood in construction to provide some character via dampening and yes, they have a very mid prominent sound.
However I've found that beyond about five neck laminates can tend to homogenise the sound. Of course there are exceptions like the Warwick Thumb which uses a highly unique combination of wood laminates but a load of boutique basses out featuring combinations of walnut, maple, purpleheart and mahogany in seven laminates (along with laminated bodies) sound more or less the same as one another, regardless of electronics.
I've long maintained the view that making musical instruments is a lot like a recipe - the ingredients require balancing against one another for an appetising outcome. In the case of necks, there's a balance in construction for playability vs construction for timbre vs construction for convenience. Some structural in-efficiency helps add character, too.
Graphite necked basses are not all alike, either. Some, especially the early ones from the late seventies/early 80's, are over designed and I like how most of the dampening comes from body wood while the stiffness allows super low action with the right fret dressing. But later on in the mid eighties to mid nineties, some graphite necks had phenolic (aka Bakelite) fingerboards that were too stiff resulting in a brittle sounding bass (classic Bartolini soapbars and an SWR amp help tame things a bit). Likewise, some suffered from fingerboards that weren't stiff enough due to not mixing the phenolic resin properly and some necks became bowed. Modulus were notorious for this with the necks they made for Musicman and Alembic as well as their own instruments, but Status experienced issues with one mix of resin briefly in the mid nineties as well.