If that means say, 1 wych squad wipes out a troop choice, gets assaulted and bogged down for a couple of turns and doesn't die? yeah that is a great trade.
Granted that fight can go lopsided because of dice on either side but that will happen in any scenario.
Who says you can get to a troop choice first?
"Don't take my win from me! I don't have many to claim!"
-Dandy