Good call out on infrastructure. Infrastructure maintenance isn't cool and there's no ribbon cutting ceremony for fixing existing capital. The new government is finally allocating more resources for DB.

Train frequency is the most important aspect of transportation. It's probably more important than max speed or even ticket price. A train every 15 min means you don't have to make an appointment because one will be coming soon. At half an hour you will need to study the timetable and plan your life around it.