I think you'll find that pre '89 Classics (ie pre Disco production) benefited from better steel.
The fact that mine has been pressure treated with Dinitrol twice in my ownership & is to be done again this summer may have something to do with it.
Yes there is some galvanic problems, but they are very minor & the only welding has been to the seat belt mounts on the rear inner wings.
The car is parked in the open with just a half-cover on it & has been for the past 13 years. Starts first time every time with a new battery every 5 years.
I wouldn't touch the newer models with a barge pole