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Takara just can't seem to fully commit to this idea, even if they see potential in it. They tried something similar again with remolds based on the Alternity figures. Now the girls were actually toys themselves, and not just packed in trading figures. But they were even MORE out of scale, and still had no direct integration with the main figure outside of just standing next to it.
Using Microman style bodies isn't a bad idea in my opinion, but if you want to have the transformers paired up with girls, make brand new molds of vehicles that actually scale to them. Maybe some motorcycles or something?