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There's no sense crying over every mistake. Just keep on trying 'till you run out of cake.
..Can't believe I actually did that. But to translate: It's an interesting idea, but you can just test things on enemy mobs. If you're not careful you might get hurt, but you can just heal afterward. No need to take all the risk out of building a trap.
The problem with that is waiting for something to spawn in exactly the right place. And in the case of hostile mobs, you probably can't spawn mobs in the right place and actually see what's happening because it'll be too dark!
This allows you to test your design in predictable, observable situations. Waiting for mobs to spawn is a bit like researchers who need mice for experiments, but can only use mice that infest the building on their own and have to wait for them to come out of a hole in the wall and stumble into the right cage.
Very true. I support.