It’s difficult to know where to begin on this topic.
it seems as though all the ebike mid motors have issues, I would say that they are not manufactured or designed for real trail or off-road use.
Bikes have become increasingly more complex, with front and rear suspension, dropper posts, frame pivots.
Bottom brackets have always been considered a consumable, placing the motor in this area is bound to be a problem.
Water gets into this area , easy with a conventional bb, Hope and CK make good serviceable units well within the grasp of most riders.
I like ebikes, this isn’t meant to be anti ebike. I am just anti the unfinished design and fit for purpose.
Given the warranty is there for the new buyer, it should be a last resort, however, the warranty seems to be increasingly used.
Once the warranty period is over, well motor rebuilds are another big expense, plus the battery losing its efficiency.
I gave up after 3 different Bosch powered bikes, all went wrong. There is a chap on YouTube who has started up rebuilding Bosch, Yamaha motors, he has some videos posted showing and explaining.
Believe he is 1200Pete, worth a look.