Making batteries exchangeable adds a lot of costs and overhead. The battery changing infrastructure is even a greater nightmare. Nio tried it and failed. With batteries getting better and better, this concept also is getting less and less feasible. It is really easier and cheaper to expand infrastructure of long range EV renting. That said, in Europe taking the train and renting an EV at the destination (range is not much of an issue then either) is probably the more relaxed option anyway, if a car is needed at all.