The poll is far too limited to be of any use, in my opinion. I like a well designed, necessary stepdown that manages heat to prevent damage, and allows for max brightness. I dislike arbitrary timed stepdowns (which may not be necessary). If I am using a light outside, at zero Fahrenheit, a timed stepdown is clearly an annoyance, rather than helpful (in almost all cases).
Zebralight's PID system, that keeps a light at max brightness, adjusting for conditions (if you increase airflow, decrease temperature, etc., the brightness will decrease more slowly or not at all), is clearly beneficial.
As usual, the devil is in the details. Whether or not I like it depends on how it is implemented. Overall I am glad that stepdowns exist...otherwise lights would have to be FAR more conservatively driven. I would rather have a 500 lumen light that can do double that for a short time than have a hard limit of 500 lumens max.