There are serious limitations to the current application of phage therapy, not the least of which is the need to positively identify a given strain you want to attack.
Isn't this potentially a feature? In that you won't be promoting resistance in non target bacteria? Seems that this would force much less over-prescription.
That does seem like an advantage, but the downside is that people who don't have access to fancy diagnostic equipment potentially just die of things that could be cured with some antibiotics....