Most boxers don't feel comfortable with "foot sweep". The reason is simple. They like to put weight on their leading leg. To escape a foot sweep require training. They just don't spend enough time in those training. Ever MA style have weakness. IMO, one of the boxing weakness is to "escape a foot sweep".Sure. But once the boxer has seen that a couple of times, the foot sweeper is going to be eating a stiff rear punch as the boxer just lifts his leg to avoid the sweep and moves right in!