No but it's the main reason. If I had a nickel every time someone told me we can do real-time sequencing I'd be rich. You're greatly overestimating our technical capabilities and underestimating the costs and challenges that would be involved. Theoretically we can identify a new phage a week after resistance is detected, factor in all of the other costs and time involved and it's even worse. The major downside of phage therapy is that there is no readily available phage if resistance develops as there is with antibiotics (the manufacturing process for a new phage is not that short). If you find a methicillin resistant infection you can give a tetracycline or cephalosporins.

Additionally, don't forget that phages are not all lytic and not all are effective (i.e. look at C. difficile) and that phages won't affect intracellular pathogens (i.e. Salmonella, to my knowledges phages don't work but please share as you say you have experience with this).

So while phages can be useful (I never said they weren't) their use is limited and has it's own drawbacks.