5) phages are viruses and our bodies are very efficient at not letting them in, so you can't just pop a pill, you need them injected into the bloodstream
6) you need a lot of phages (and/or a steady supply of them) because they don't replicate in our bodies (they don't infect us), but our immune system is very good at clearing them out so their blood concentration drops really fast
7) because phages are viruses and we need them injected into bloodstream in copious amounts, our own immune response to them may become a problem. Potentially-fatal-cytokine-storm kind of a problem.
5) phages are viruses and our bodies are very efficient at not letting them in, so you can't just pop a pill, you need them injected into the bloodstream
6) you need a lot of phages (and/or a steady supply of them) because they don't replicate in our bodies (they don't infect us), but our immune system is very good at clearing them out so their blood concentration drops really fast
7) because phages are viruses and we need them injected into bloodstream in copious amounts, our own immune response to them may become a problem. Potentially-fatal-cytokine-storm kind of a problem.