I take it you are referring to the BMW having been built 3 decades ago..? The same is very much true of the Japanese cars as well.
I would love to see some stats on vehicle reliability, not the JD Power rubbish which factors in customer expectation, but proper failure rates per 1000 vehicles for instance.
Having worked with, and owned, brands from UK, Europe, Japan, US and Aussie there are horror stories and problems behind the scenes for all of them. There is a class suit against Toyota in Aussie at the moment due to vehicle issues. Worst two cars for problems I have owned were a Mitsi and Subbie - both Jappers!
There is so much more equipment on modern cars, that has to be developed so quickly, that there are much higher chances of things going wrong. Doesn’t matter where in the world it’s made though, situation is the same.