Yes 100% right. Japan has the same where the Shinkansen uses dedicated track. If I do not say a mistake, China does the same too.
The fact it never has been done in a modern country like Germany with a dense high speed train traffic like the ICE is clearly a sign of planning deficit from the authorities.
The Shinkansen initial network and separated tracks have been built at an age where JRails was still a single centralized company.
The main reason was to create a network with a focus speed and punctuality. And to be fair, it was the right choice and pretty revolutionary at the time.
That is not true, some TGV dedicated stations have been put in remote area (mostly in far right areas), but there are lots of cities that have high speed train stopping at the central station in the center.
Switzerland doesn't have high-speed trains, only low-speed ones. And all timetables are carefully tuned to half- or full-hour station distance intervals that all trains on a track take at the same speed ("Taktfahrplan").
Germany has the worst of all those worlds: No Taktfahrplan (because it probably would be impossible due to the larger and far more complex network), high- and low-speed trains on the same tracks, and only some sections of dedicated high-speed rail that drive up the cost but still have shared stations and sections with low-speed rail so that punctuality goes down when the tiniest thing goes wrong.