It wasn't really a problem of lacking "proper" alloys, magnesium ones are very light, and sometimes this is exactly what you need. Take a look at the Sikorsky Ch-34, 1950s medium size helicopter, powered by heavy, radial, piston engine (low power to weight ratio), everything else had to be made as light as possible - so the whole fuselage skin was magnesium alloy.
As long as it's not for load bearing parts it's ok. Corrosion is not that much of a deal, unless you want that "bare metal" finish, than it's problematic even with 2024 (or 7055 today).
And I'm engineer... I don't trust anything unless it's made out of high-carbon steel
