That's not a great tactician if they get tied up and killing those Y's isn't the smart move.
The advantage of ywings is they take so much to kill. The longer try squads are tied up trying to kill my ywing, the better off the rest of my force will be.
Except Y-Wings can't tie up anything. They're too heavy.
By the rules they can't, psychologically they can.
That, my friend, depends entirely on the circumstance. :3