"He says some of the first-generation motors had experienced problems caused by water, but later models had been enhanced with improved seals and bearings."
I wonder if these owners simply kept getting gen 1 motors, or whether Bosch is just lying. LOL
From personal experience buying certain car parts, sensors and electronic components... "Bosch", "Premium" and "Quality" are words that shouldn't be in the same sentence, and haven't been for a bunch of years already...
Ironically, and anecdotally, I'm running a cheap motor from an unknown manufacturer in a very wet environment as a daily rider for years and I haven't had any issues.
Yeah, my son was riding a Ninebot (e-scooter) through all kinds of weather, heavy rain, salted roads, summer heat, (Canadian winter cold) and that thing had at least 8000 km on it without any fail. Not to say that Ninebot are some unknown manufacturer, but I wouldn't have considered them better than Bosch.