I don't think it's a lot of people who broadly think vintage instruments are 'better', I think those who play 'vintage' instruments (and I'd probably suggest that means pre 1980 in the context of this discussion) are the minority and a LOT more people play new/modern instruments, and those who ONLY play vintage instruments because of a perceived superiority is even fewer than that. I imagine, in most cases, any instrument used at a given time is seen to be the best instrument for that purpose for that player, be it vintage or otherwise.
I bought a 1971 Precision because I was interested in an instrument that would hold (and increase) it's value, that said, I've never played a better sounding Precision with flats than this....and that includes a 1963 Precision I borrowed for a few gigs. There are probably modern Precisions that are as good, but I've yet to play them.
Conversely, I've never found a vintage Jazz bass that I've gelled with, so my very new Lakland 44-94 does that job for me, lovely bass and nicer than any vintage Jazz I've played.
Si