Anyone here a pharmacologist? I was wondering why we can't deal with the antibiotics crisis by engineering bacteriophage viruses?

From what highschool and college have told me about how it works, it sounds like it shouldn't be too much of a problem to make them invisible to our white blood cells either. although I'm sure there're a dozen different reasons my idea is idiotic, so let's hear them.
Anyone here a pharmacologist? I was wondering why we can't deal with the antibiotics crisis by engineering bacteriophage viruses?
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