Japan has "Super Tickets" because it allows you to combine a shinkansen ticket with other rail journeys and use a single base ticket to connect between any two stations on the network, many with different infrastructure owners. It's very convenient once you grok it.

Often the Super is printed on the base ticket if you buy it together.

But maybe you use an IC card or virtual IC card and put the super ticket on it using the SmartEx app and reschedule or cancel with a few taps. Some people do that instead of whinging about inflexibility of legacy systems that still exist but no one uses.