Certainly I've some time to think about that contention.
I still believe it to be true, but I do see the influence of personal experience and style.
I believe submission is more interesting to write about (and thus to read about, and thus, to experience) than Dominance because of the delicately balanced places that certainty and uncertainty occupy in the life and mind of a submissive.
Consider . . . the person in the submissive role ideally has a healthy measure of certainty and uncertainty in his or her life. s/he needs to feel confident in the love and care and concern that the Dominant will feel and exhibit. Without that, there is simply animal fear, and animal fear never taught anyone anything except how to behave like an animal. The submissive must be able to see, understand, and trust in his or her Owner. The degree to which s/he is able to feel that (that is, the degree to which the Dominant inspires it in him or her) is proportional to the depth of submission one can eventually feel.
But at the same time, the submissive needs to feel that excitement, that thrill of not knowing what is going to happen next. That is absolutely essential, and is probably the single most exciting thing about submission on a day to day basis. What will S/He think of next? Sometimes the thought, the imagining itself, wrapped as it is in the delicious state of not-knowingness, in and of itself enough to make submission deeper. Not to mention more fulfilling and more fun.
That heady mix, that living, breathing, daily paradox, the clashing balance of the known and the unknown, to Me, is the stuff of great novels, of lyrical epics.
This other thing . . . being the One to dream the stuff up? Being the one in charge? It's wonderfully fulfilling, as for writing, it's easy grist for the essay mill, but not Shakespearean the way submission is.