I don't know about e-mopeds, but E-mtbs do need more maintenance then trad bikes - bearings don't seem to be much worse, but suspension gets worked harder and drivetrains get thoroughly abused. It's something that is pretty huge for me - the type of bearings, the way they are arranged in the frame (eg widely spaced and using double shear bolts) and how easy they are to replace. A lot of frames use massively undersized bearings so I would look for at least 69XX or 60XX sized bearings in all the pivots. Specialized mostly uses 6800/1/2 in their pivots, and...