Why isn't dough ever leavened on top of a warm surface?

I'm in a hurry. I've made the dough just now, and now, I've put the dough on top of a heating pad that's slightly warm. Would this expedite the rising time?

I've never seen a recipe mention to allow bread dough to stay warm like this. Is there a reason? After all, when I make yogurt, I keep it on top of a heating pad, and it's perfect.

submitted by /u/mcat36
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