In an ICE you can have an air/fuel/electrical issue, and the entire system is designed to overcome the inherent design flaws of the technology, thus making it convoluted and difficult to understand. Not only can an EM be explained and taught far easier than a full ICE breakdown, but you can literally build one as an Elementary school science project with some copper wire, batteries, and magnets. The technology has only one point of failure as opposed to three. If it doesn't work, electricity is the ONLY possible reason.

EM's have a significantly smaller chance of failure due to the simplicity of the design with fewer moving parts, so while current EM's aren't really built to be repaired by their operators, one that's designed to be would be incredibly simple for the layman to understand and repair had they the knowledge and tools available. The technology itself isn't the issue, in fact, I'd argue the average random could learn how to repair an EM in much less time than an ICE, we just don't build them that way currently (like how we don't build modern ICE's to be repaired by their drivers.)