Yes, it's very easy to add. It's also very easy to remove if Google decides down the line that it doesn't want to pursue it. I don't see how adding a feature that Google has deployed as part of its primary service is in any way 'a fail' but you are of course welcome to your own opinion.
People also complain about all the bloat that is in vBulletin as well
Glad it'll be easy to remove down the line if needed.
Is there going to be a native stumbleupon badge as well? My point is why worry about this when there are much much larger issues that need added/fixed.
My suggestion would be to use an "all in one" service like addthis or the numerous other scripts out there like that, or for that matter, why not code one in house and make it exclusive to xF forums.
Just a suggestion, don't take my "fail" comment personally.