The problem is very often not a law, but space constraints. Often the city grew around the commercial area and there’s just no space to grow. And even if space

The problem is very often not a law, but space constraints. Often the city grew around the commercial area and there’s just no space to grow. And even if space is available, it may be costly. So there’s essentially two options: stop growing or move. The industrial or commercial area not having a bike lane or a tram connection is not a law of nature. Those can (and should) be built when you open a new zone, especially one that has ten thousands of workers. This used to be common and sometimes even financed by the company, for example the Siemensbahn in Berlin - paid for and constructed by Siemens to facilitate worker access to its plants https://en.m.wikipedia.org/wiki/Siemensbahn https://en.m.wikipedia.org/wiki/Siemensbahn