I was joking with the madwoman comment, of course one should always look in control at least to the extent that you seem stable and IN control of your own movements. But without solid technique and lots of experience, that's just not always possible when you really go for a movement. So, it is a choice: do I risk getting out control for the sake of 100 percent commitment, or shall I focus on staying in control and be precise but perhaps a tad less "going for it?"
I used to give my 100 percent to every round and movement. This resulted in (1) me being exhausted by the end of the first round, heck by the end of the first cha cha, because really, one can go about 5 seconds with truly full commitment (literally. A sprinter can sprint at her absolute fastest speed for about 5 seconds) and (2), a world champion walking up to me with a comment, "I admire your commitment, but I got exhausted just from watching you," which was not meant as a compliment.
Now, my new strategy is to give only 87 percent in the first events or rounds and give my 97 percent to the last one, while also working on stamina. The remaining 3 percent I retain so that I can occasionally smile, get to the the end of a full round, and avoid the "she is fighting for survival" look.
Passion can be either controlled or uncontrolled. Both are effective. But I do think passionate dancing is fully committed dancing, one way or a other, which is not to say one must be always fully committed and/or passionate to be entertaining. IF you have the talent and skill set of a B Watson, you can just have fun on the floor and still look great and highly entertaining. Me, I cannot afford that.