If the fingerboard is the most important part of a Sadowski bass's tone, does that mean you shouldn't play open strings on it
Interesting thread this, just read through it all. I personally think the amplifier/speakers, pickups, strings, electronics, and technique have a much greater bearing on a bass's tone than the wood. The pickup is not amplifying the vibrations of the wood, it's converting the oscillations of the string into an electronic signal. The wood will affect how long the string vibrates and which harmonics are strengthened or supressed, but you'll alter the tone much more by rolling off a bit of treble, plucking further up the neck or changing roundwounds for flatwounds than by swapping a maple top for a zubinga one or whatever.
I bet no-one in the world can consistently identify what type of wood a bass is made of just by listening to it, but I reckon a lot of us could spot a roundwound or flatwound string.
If someone wanted to 'upgrade' their sound, I would recommend buying a better amplifier as I find this to have the most influence on the sound. A cheap-ish bass through a great amp will sound ok, but the reverse is never true.
BTW my favourite bass of the moment is a Squier Classic Vibe precision made of basswood which plays and sounds great.