Agreed! Do you know much about this area?
Not directly. I just read a lot. I'm a retired chemist who did chemical instrument design, and one of the projects I worked on was the microfluidic detection of biological warfare agents as a consultant with LLNL.
The instrument used two approaches, a set of fluorescent beads with antigens for different species (one per bead) to do the initial detection, and a followup PCR specific to (for instance) anthrax as a means of preventing false positives, all automatically.
That background lets me at least vaguely understand the usefulness of antigen-antibody chemistry for a topic like this.