Admittedly I've never used an armbar/lock in a real life situation, but I too was taught to strike first. I think for the most part that's a good idea just because it takes the opponents mind off of the limb you're about to control.
In theory, I suppose if you're fast you could do it without needing any strikes. The real issue, I would think, is if the opponent saw the attack coming, but if you're fast enough that would be a non-issue.
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