in Germany you can print out or see on the DB app the scheduled platform. Maybe an electronic notification is a more reasonable expectation rather than the pretty low-tech tickets that are widely used.
Platform alterations happen in Germany too. They are less common, though, because most stations are very generously supplied with platforms, owing to the combined efforts of the post-1871 regime and the RAF. Köln Hbf is the only exception I can think of, and so it is worth providing printed information (e.g. the Reiseplan on IC/ICEs).