Germans love a rule, love pea counting, and they will measure.
Your insane argument doesn't quite work for me when the mutual benefit of the practice was to provide ample space for fire trucks and ambulances on the roads. This is not a matter of the city just not giving a shit. They weighed their options.
Another aspect that wasn't touched upon in the article will also play into this: parking fines are a great way to get money into the city coffers. So it will probably pay off to get members of the Ordnungsamt - or the office of public order - who handle these things out in force armed with a tape measure and a camera and chi-ching for Munich's revenue.
In principle, I agree with you. And do you know why hardly any city government can put this rigorous approach into practice? Because they will be voted out in the next election. Because car ownership is still high. Realpolitik applies here.