They strengthen the hand of you as defender of the sober status quo, against the attacker who wants you to relapse.
Critically, all these defensive measures buy you time that you can use to organize and deploy more defenses. Maybe the long Uber ride to the liquor store gives you enough time to think about your actions so you call your sponsor from the parking lot. Defense is useful even when it only slows your adversary, rather than stopping your adversary in their tracks.
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