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The main arguments are in the first two paragraphs. Basically, you can always surrender, so why not try to fight for a while.
The rest are just my ideas; it's not certain that Britva thought about them; he was just playing.
Regarding Blind/Disrupt – this is a very effective strategy against powerful stacks. I myself have killed 20 Archons with some weak army using this, the main thing is to not run out of mana too early, and Expert Fire Magic + Air Magic are also welcome, as are expendable creatures.