I disagree. Yes, construction has advanced, mostly at the top of the market. Epoxy pre-pregs and exotic cores can produce a better boat but not really in the more affordable categories. Hardware like winches have improved a bit but there is nothing wrong with a good self-tailing Barient from 30 years ago. Sinks haven't changed much at all.
Most new boats still have stainless chainplates.
A boat well built in the 70's that has been maintained and upgraded as necessary and maybe re-powered has a great deal to offer.