I guess this is one big reason why we’re looking to ditch it. 
In any case, I agree with the comment you made in the doc: we should just put epic descriptions somewhere else that can be easily accessed by us and clients. The only requirement I’d add is that such a place has to track the history of changes. Google Docs does that, and it’s already the default way we share discovery documents with clients. Its probably a reasonable, low-impact choice.