You may have heard it, but I expect its bunk for the most part.
I will say that I think vintage turntables are much better in the main than most modern offerings.
Too many modern turntables have platters that ring like bells. The drive belt it outside the turntable, where it picks up all sorts of contamination, including finger grease. That is a stupid design for a start. Many pick up arms have glaring defects.
I will say that an acrylic turntable has high mass and would be non resonant which are big pluses.
Some turntables have ferrous metal turntables which is a total disaster as the magnets in the cartridge are attracted to the turntable. That is a major crime.
Good vintage turntables, and some modern ones, have massive non ferrous turntables, that are totally dead and non resonant. Ideally an arm and cartridge should be designed as a unit. Only the Decca ffss heads and arms were designed that way. This makes it possible to tightly control the resonance, which does have an impact on bass reproduction. The vintage SME series III arms were designed to perform optimally with the Shure V series cartridges. In addition damping of the arm was provided, which definitely does improve bass and reproduction all round. Also the later versions of those cartridges conducted the static away through the damper.
Getting really good LP reproduction is difficult, and requires a careful balancing of the shortcomings of the medium. I do think on the whole these were handled better in times past than now.
Really a vintage rig like this properly set up is superb.
This is my Thorens TD 125 MK II. I bought it non working and restored it, so I just about stole it. The arm is an SME series 3 and the cartridge a Shure V 15 xmr. This is now NLA so a good substitute is the Ortofon 2M Black.
That rig is in our family room.
My main turntable case in in the AV room. These pictures were in our former residence, it is now moved to out new AV room. These turntables I have had for most of my life.
Garrard 301, with Decca ffss H2E and professional arm.
It also shows a rare Auriol lift that I restored.
Thorens TD 150 I bought as a teenager, now has SME series III and Shure V 15 xmr.
Garrard 301 with SME series II improved arm and Shure V 15 xmr cartridge.
I can assure you there is nothing wrong with the bass of any of them, or a need to change anything from original except the damper to the series II arm, as that was a later option.
In other respects everything is in original working condition.