4-4-2 can also be beaten by the butterfly formation. 4-5-1 V isn't as effective if the opponent puts red arrows on ML/MR. Butterfly takes care of that with the wingbacks
Tried butterfly formation against 4-4-2. Won 2-0 first leg CL. Gotta change formation after 65min for an injured player. Might win by more goals if still with butterlfy formation in whole match. Will experiment again during 2nd leg.