I had to travel from Copenhagen to Berlin and Copenhagen to Basel several times, and I was open to choosing a train, but ended up flying to avoid dealing with DB. I really didn’t want the risk of missed connections cascading into messing up my appointments and vacation plans. And now with Fehmarn Belt link under construction, I ask myself, what’s even the point of shaving off a couple of hours from the trip duration if I can’t rely on DB for reliability anyway?