When quote-posts become baked into #Mastodon and available via the API, I hope clients stop fetching quoted posts on their own.
Part of Mastodon's implementation will be the ability for people to prevent quote-posting of their content, and to "withdraw" their posts from anywhere they were quoted.
"Faking" quote-posts by merely fetching the post object from within the client will not respect these preferences and intentions of the quoted user.