Apparently, you seem to associate "DMR" with a system with repeaters connected via the Internet in a global network. It is not so. DMR works simplex just fine and has the advantage over FM of better spectral efficiency. It also allows for data transfers and the built-in short message system can be quite useful. It allows for encryption, often a requirement in disaster recovery. Last but not least, it allows simple deployment of ad-hoc repeaters. This has led several countries to choose that standard for their civilian operations.