Major Japanese train stations have so many platforms (Tokyo have 22), 1 platform for each route or destination.

In Germany train station a platform can host multiple route.

That's always the case for through stations, I believe. However even terminus stations don't have their platforms locked to a fixed destination. Milan Central station has 24 platforms and each of them hosts multiple routes. Rome Termini has 32 platforms, same thing. You can monitor departures at this link, if you are very patient to keep track of them

https://iechub.rfi.it/ArriviPartenze/en/ArrivalsDepartures/M...

Of course usually the same train departs every time from the same platform. I think that it helps everybody.

But it means if a route has an issue it will cascade to another routes that share same platforms.

Japan has mostly purpose built tracks which makes it a lot easier. Still impressive though