On the other hand: If the assembly is reliable-enough, then repair isn't normally something that needs to be pursued in the first place.

Like Honda engines on their myriad pedestrian cars. I'm sure there's exceptions, but the engines tend to be ridiculously reliable. The rest of the car often fails (due to age and/or rot and/or deferred maintenance and/or crash) and leaves a very good engine behind.

Accordingly, junkyards are full of Honda engines that work fine.

Thus, there's very few people rebuilding them. They certainly can be rebuilt, but it usually just doesn't make financial sense to strip it all down and freshen everything up.

So when an engine does fail on an otherwise-working Honda daily-driver that is actually worth repairing, then the usual move is to swap in a used motor.

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So if it's reliable enough, and there's also critical mass, then it doesn't matter much if the BYD drivetrain unit has easily-repairable components.