You have to "rush". But its not really a rush. Most people are just slow. The average top player is at t2 in 10 minutes, so if they don't field t1 units immediately there would be no t1 combat.
I do think its a bit flawed on small maps though, like winter's where a fast attack bot could luck out and kill an engineer in the very beginning and literally swing the game in their favor.
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hmm, what to put here
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