New cars are better than older cars in just about every way, But there are a few things older cars had in their favor that newer cars have lost.
Plusses for older cars...
Manual transmissions used to be available in just about anything, and made driving even the most basic vehicles more engaging. Now manuals aren't available on many sports cars. Those that do exists often have annoying rev hang.
Visibility. Older cars had large greenhouses and great visibility. It really changes the driving experience. Wouldn't like to be in a wreck in one though.
Lower hoods. Pedestrian crash standards have raised hoods, making styling on sporty cars challenging.
Plusses for newer cars...
Power. Newer cars are much quicker, despite the extra weight.
Ride and handling compromise. Even basic cars handle pretty good today. Back in the day, even sporty cars were softly sprung, rode high, and needed suspension work to handle better and look right- and rode like crap as a result. Modern cars are much better right out of the box.
Brakes. Older cars came with brakes that were barely adequate, and early ABS systems were often a hinderance when driving hard. New systems are much better.
I've thought of selling my older fun cars and buying something new, but there really isn't much comparable out there. Sure, many new cars are better in many ways, but I'd miss some of the traits that I really enjoy. I'd say my 2005 Legacy GT wagon is right in the sweet spot. It's like it's the newest of the old guard, just the right mix of old and new. Great visibility, low hood, manual, pretty simple car overall. But it's much safer than most/any '90's cars, yet lighter than newer cars. Great brakes. Good power stock even today, no trouble making more. Nice looking yet still basic interior, great looking exterior. I'd have no desire for a modern version if they made one.