Imagine a game state - I have a majority of the map, but I couldn't finish OP off. I have T2 Botlab. He has T2 Vehicle Plant. He builds 1 radar bot, 1 antiradar bot, and pumps Banishers.
He has 3 Banishers, and I can't get any of my bots close enough to do damage. They all get slaughtered. Bam, stun, can't move. Die immediately. Tried air units? Banisher missiles kill air, too.
How TF can I take a cost-effective trade against 3 banishers if he's supporting them with 6-7 T1 assault tanks?