You may nog hear it a lot because it's mostly warranty issues and consumer protection is pretty good here so with most issues it'll be handled quickly and under warranty.

I've had pretty much my entire electric drive system replaced under warranty with my first electric bike (admittedly I rode a _lot_ of km with that one.) Then on the second it's been in the shop at least once a month for ~1.5 years. Sure it was all covered by warranty but the amount of hassle did make me reconsider and go back to a regular bike.