The rule was actually established by popular demand.
The reasoning behind the rule is that a) long prompts don't leave potential fillers room for anything and b) if a prompt is longer than the length of almost 3 drabbles combined, maybe the OP should write the story themselves.
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Reasoning behind rule
(Anonymous) 2016-04-20 03:15 am (UTC)(link)Re: Reasoning behind rule
The reasoning behind the rule is that a) long prompts don't leave potential fillers room for anything and b) if a prompt is longer than the length of almost 3 drabbles combined, maybe the OP should write the story themselves.