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definitely agree that the topics that are equivalent between EV/ICE should get their own page and just be linked to both. I think it should be reasonable that drivetrain is similar enough between ev/ice that one article can fit in both, not sure about direct drive/ in hub motors, but it shouldn't be that hard to tackle honestly

testing/validation definitely deserves an article by itself, its so general, i think the bit in the drivetrain section should be specified to testing procedures and stretegies for drivetrain and leave all the philosophising about validation to its own article