Finally, a voice of reason.
To be fair, one of the things that often happens and that is difficult to not get caught up in is comparing a couple of similarly spec'd basses and then attributing tonal differences to the most obvious difference (i.e., bolt-on versus neck through, finish type, etc.). Every bass sounds different...even literally identically spec'd models (wood is funny that way), but it is VERY difficult to attribute a tonal difference between instruments to a single spec difference (weight, finish, etc.) without a large sample size.
I'm sure back in the day, there was a bit of difference between those early, very thick poly finishes and the very thin nitro finishes. Today, with each finish seemingly being about the same 'thickness', and especially with luthiers who use top shelf, old, appropriately dried wood, I view finish as a pure aesthetic desicion.
IMO (and IME) of course!