An interesting discussion, and one that led me back a few years.
Growing up my fantasies were on the sub side.if they involved BDSM at all. however, in the first long relationship I had, we both switched.
However, it wasn't as satisfying for me to sub, so that slowly went to full dom.
I've switched once since then, and didn't enjoy it at all, and now I ID as Dom.
I can't see myself subbing for anyone now. However, I wouldn't look down on someone for being a switch. Are we really that broad and widespread a church that we can split like that?