my take is far more relaxed than that; even a feed reader needs to retrieve copies of all of the remote content - and then it stores it in some kind of repository - so (unless you particularly worried about the integer post count being roughly correlated with the amount of postings you make on your WP blog) why not store and garbage collect them in WordPress?
Edit: that being said, I too would like to see a few more global settings...
Oh, I agree that the content has to go somewhere, which is why I’m sure to set retention levels for almost all of the Friends data. That sort of thing is settable by default in feed readers and podcast players.
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Alec Muffett (GitHub)