Berlin is quite a unique capital in that it's relatively poor and contributes relatively little to the national economy. Apart from its size warranting certain infrastructure with sufficient capacity, it'd be surprising if it had much better infrastructure than it does. Its economy doesn't easily allow it.
https://www.statista.com/chart/15738/the-contribution-of-sel...
https://qz.com/753244/berlin-is-the-only-capital-city-in-eur...
Berlin is quite a unique capital in that it's relatively poor and contributes relatively little to the national economy. Apart from its size warranting certain infrastructure with sufficient capacity, it'd be surprising if it had much better infrastructure than it does. Its economy doesn't easily allow it.