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The point is that if it was created through magic, it's not science fiction. That's the difference. If it was created through technology, it's not indestructible. You could cut the power source. You could disrupt the field perhaps. If it's magic, it doesn't have to adhere (and probably doesn't) to teh laws of science. There might be ways to defeat it other than casting some magic spell or something, but that's not explaining its origins through science. Matter and energy may not be destroyed, but that doesn't mean that an energy field is indestructible.
Now, from the players' perspective, they don't have to know the difference, provided that the game culture (something else most often ill-conceived) doesn't provide them a knowledge base regarding that technology (or they're some sort of fundamentalist that simply refuses to accept reason). But if the game's designers haven't created an explanation behind the "force field" and simply say it's magic, that's not very good science fiction.
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