I think one of the questions was whether the Dom/me needed to be ABLE to overpower the sub in order to be fully Dominant, not necessarily whether s/he needed to do that all the time as an exercise of Dominance. I expressed my opinion before that I don't think that is a necessary prerequisite for all D/s interactions.

Reading this thread makes me think, in a way, that for a lot of people force can be another tool in the Dominance arsenal (mixed metaphor?) - it can be fun to be overpowered, and it can be helpful to feel that the Dominant partner has the ability to overpower the sub, but it's not necessary any more than it's necessary to have any other specific D/s toy in your toy bag. (Oh those metaphors.)