Actually, modern steel is far better since it is made with a high chromium content that resists corrosion 10x better than the vintage steel did. The average age of used cars is more than 3x older than it was 30 years ago as a result. Look around and tell me how many 10 year old+ cars are still on the road vs. 30 years ago.
My ‘06 SRT is 12 years old and has never been garage kept. I drove it daily year ‘round in all weather for over 10 years and beat the hell out of it. Underneath, it looks like it is 3 years old. Even with 10 years of driving in heavy Winter salt.
The past wasn’t better, modern technology is.