Avendere:
If you seriously think that the 70s construction with nailed/screwed single plasterboard on 60cc studwork was good, then you're not serious. These walls are among the worst built in Sweden of all time, the whole wall shakes if you hit it a little and if it concerns a bathroom, it's just about screwing double plasterboard or tearing and framing tighter.
Then you may have screwed 3000 molly in your wall, that doesn't mean that 60cc with single plasterboard is a good construction.
Best regards, Jawen