Eh. I don't think it's a reduction, I genuinely think it's that Universe 6 Saiyans are just different. I mean, they don't even have tails. And Cabba leaned it just as fast.
Yeah, but at least he got the shit beat out of him, and Vegeta threatened his family or some cool shit like that.

Cauliflower learned to tickle her back with her chi. :S

I'm just venting, not really serious. DB can continue to be DB.