In my opinion it is not a problem to have route badges for event-only routes. Most riders manage to organize time to join relevant events to earn them. But it is a problem to have badges for event-only routes which do not make sense to be used for an event (like Macaron) so there actually are no events on that route available - ever. This is frustrating. It is also an issue to have place holders for new routes long before those routes are avaible to anyone (event-only or not). This is frustrating for badge hunters like me and makes the achievements overview messy. Years ago it was not necessary to publish these place holders on such an early stage. Why now?
My suggestion is to use the “hiding feature” for new place holders as long as the specific routes are not available (event-only or not). I also suggest to not have route badges for event-only routes on which no significant number of events are likely to take place.