Yeah, both Switzerland and the Netherlands have distributed networks like Germany, but their relatively small size means that they don't need to design around speed, and can focus more on synchrony.

That said, this doesn't mean it's impossible the fix Germany's trains. Germany's network did work quite well before, and it can again. The fixes are happening right now, but it's going to get worse before it gets better, because all the construction that needs to be done interferes with the network.