Sorry Rudolph, as I tend to do, I'd edited my post for clarification, not realising you'd already quoted it.
Totally agree, I don't think of my characters in terms of Dom/Sub/Switch, or stick them with an overarching label (I will use those terms where they have an applicable meaning within a specific context), as I don't with myself. I'm just 'me', which can mean a variety of different things at different times.
One of my favourite themes is competition between two equally independent, assertive and confident characters, as it's a personal preference, plus I think it opens up a lot more options, and provides much more unpredictability to the story, in comparison to having designated 'Dominant' and 'Submissive' roles.'