I'm one of the people that always pushes against it. The idea of having to throw out the four lists I've finished is enough to make me not want to participate, tbh.
Plus, two hours is a really arbitrary limit that doesn't work out well in a disc format. Some of us like to make longer lists, some don't. There's no one preventing us from making shorter lists, and it's sometimes very difficult to make a good one of that length anyway; I always feel like I'm rushing through the process in mini DI, as one disc limits obscurities and details in favor of a big-picture quality that I personally don't find all that rewarding (this is why I like major restrictions in mini DIs; it's possible to represent a genre in one disc). I can't tell a story or paint a picture in that time frame, the way Reggo did with her list.