From what I've read. You're probably right. They're worried that mutations make it hard to lock down the exact properties of any given phage treatment, but that

From what I've read. You're probably right. They're worried that mutations make it hard to lock down the exact properties of any given phage treatment, but that would be a risk I'd be willing to take. Especially since they're in wide use in some countries with no horror stories that I've heard.