What single-mode lasers do offer is a means of inconspicuous communication. If you can aim your communications channel at a receiver, you cannot easily be detected.

But life could do similar things with collimating reflectors, even for sound. Are there organisms that use geometry to shape sound to send a signal? I'm only aware of ones that use geometry to boost/tune their reception (e.g. owls).

Edit: Dolphins apparently

The ability to dazzle an attacker or prey seems useful when one is hunting the other.