you know... there's such a thing as empiric research. There have been plenty of people who tested this and you (yes, even YOU) can just go on the interwebs and look for such evidence. It will be pretty overwhelming and you will realize pretty quickly, that it just doesn't matter what kind of wood your electric bass is made out of, if you plan on playing it... you know.... with an amp. BUT, you don't have to take my word for it. Go buy a piece of plywood and screw a string and a pickup to it. Try to roughly tune it to pitch and get a bass with the same strings and pickup. Play it, record it, convince yourself that it truly does matter. Take the audio clips and compare them. Ask someone to play them at random to you and make a quiz out of it. See what you'll find... I just feel like it's a bit of a waste of time, since many people have already done exactly that....
But if you want to believe in something, then that's good for you. Placebo is a real thing and can help you in your eternal search for meaning and happiness in life (no sarcasm). But don't expect everybody to applaud you when you come forth with such an opinion and act like the others are being mean to you... I'm sorry, but that's kinda how it goes when people hold onto weird / controversial beliefs.
If the shoe fits