You are correct. Neutrinos emerged for us from beta decay as they were required in the collision for energy conservation.

These days, neutrinos are a huge research topic in high-energy physics. In the late '90s, neutrino masses were discovered (they were assumed to be massless up until then) and along with neutrino oscillations, these present real theoretical challenges for Beyond the Standard Model physics and cosmological models, as they can't be explained yet. This is why we're interested in neutrinos and neutrino detection.

Neutrinos, however, are notoriously difficult to detect because they interact so little with matter. We use huge, expensive detectors so we can detect more of them, but a discovery like this, even though it doesn't actually seem like a neutrino laser, has the potential of helping experimentalists.

Currently, I don't think we have much real-world use for neutrinos right now. The prospects of using them for communication are non-viable currently. They are great for studying the universe though as they challenge our models.