Expert take
Swain MID is an excellent pick for players who understand fight tempo more than simple combo execution. He does not win because he surprises a target in one second; he wins because he makes enemy space uncomfortable, forces bad decisions, and turns a poorly exited skirmish into a fight the enemy can no longer leave. His real value appears when you know how to wait for the right first contact, use E to lock the escape, then enter with R once opponents have already committed resources. Pick Swain if your team can play around objectives and maintain the fight. Avoid him if you must create all the action yourself against a mobile draft.