The idea with warp prism zealot harass is generally not to kill drones, they are normally warped into the back of the main, with or without dts to snipe key tech structures and force the zerg army to move out of position leaving his expansions open, it can also be used to buy time to secure more bases or tech.
What's the benefit of killing tech structures over drones? I mean, apart from the obvious. Why is it better to kill say a Hydra den than to kill 5-10 drones? Economically, I would have thought that the drones would have been better?
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