User blog comment:Fistful of Force/Lane swapping: The forgotten tactic/@comment-5514182-20130201230826

The problem is, you're probably being asked to take over a lane with a fed opponent, while your ally tackles a still unfavorable lane while underleveled and underfunded.

Lane swapping is best done when you know you've been counterpicked from the start, like leblanc vs karthus.