I can tell you that in the US, with a Tesla, I still use ABRP to plan out longer trips. I have found that Tesla's built in Nav is actually pretty solid, but it doesn't take into account the whole trip (or didn't... waypoints were just added, haven't tried now). With ABRP, I would usually plan out the whole trip, and then in the car, just select the next supercharger, so that the car would pre-condition (and yes, even driving for multiple hours straight, the car would still pre-condition... BMW may be different). That worked well for me, and I've gradually started trusting the built-in Nav more and more.
It will take time to trust the car.
It will take time to trust the car.