I would avoid vintage tonearms unless they are extremely inexpensive.
Basically they are inexpensive, for example Technis EPA-100 cost under $1200-1700. There is no reason to avoid vintage tonearms if you know which one is really good, only people who know nothing about tonearms can make such statement like yours. You will never find anything close to the performance of EPA-100 among any modern tonearms at the same price range! Japanese vintage tonearms are reasonable priced and better than almost everything new. And some better modern tonearms cost over $5000.