Although the construction of the flak tower in Berlin was progressing slowly, for the most part, the German government did not need to use it.
Because once the Berlin flak tower was activated, it meant that Berlin was facing a considerable crisis. If even the capital faced such a serious threat, wouldn't that mean that Germany was on the brink of extinction?
At least for the current German Empire, such a scenario was not likely to happen. Since deploying a large number of aircraft in Germany for defensive purposes, it had become quite difficult for the British air force to penetrate the airspace around Berlin, let alone advance into German territory.
After all, there was no so-called stealth technology at the time, and airplanes were almost completely visible under radar detection.
To allow bombers to enter the airspace of Berlin for an air raid was as difficult as allowing an army to penetrate deep into Germany and capture Berlin.