Hmmm....*looks deep in thought*
What a fascinating concept.
Actually, even though i don't (in accordance with my posts on the thread to which Curtis referred) think that a dominant should step out of a relationship to be 'trained' as a sub (because cold training is not a relationship...and so on and so forth!), i certainly don't think having some experience of the practicality of subbing is a bad thing.
i use the word practicality for a reason, because whereas i think that it would perhaps increase empathy and understanding via pratical experience, i don't think a dominant could ever 'think' like a sub or ever truely experience the same feelings that being dominated evokes...so it's kinda...logically limited experience.
So, yeah, i can well understand mastercoyote's sub saying it has a positive effect on her confidence in him, i don't think it's essential, but i certainly don't think it could do any harm.
sl